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authorKarl Berry <karl@freefriends.org>2021-01-09 21:36:18 +0000
committerKarl Berry <karl@freefriends.org>2021-01-09 21:36:18 +0000
commitb33d382702e71037548dba5374e276b861ea8031 (patch)
tree1670ea7d19f460766341de9e97fe76c8bd09931f /Master/texmf-dist/doc/latex-dev/base
parent23616a07e621fb344c8329dfa20c60408b644d95 (diff)
latex-dev (9jan21)
git-svn-id: svn://tug.org/texlive/trunk@57365 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Master/texmf-dist/doc/latex-dev/base')
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/README.md2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/alltt.pdfbin173079 -> 172584 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/cfgguide.pdfbin220217 -> 220226 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/cfgguide.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/changes.txt176
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/classes.pdfbin520851 -> 520832 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/clsguide.pdfbin372555 -> 372576 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/clsguide.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/cmfonts.pdfbin264505 -> 264510 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/cyrguide.pdfbin216997 -> 216995 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/cyrguide.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/doc.pdfbin630914 -> 631310 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/docstrip.pdfbin479526 -> 479297 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/encguide.pdfbin1532144 -> 1532142 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/encguide.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/exscale.pdfbin195877 -> 195882 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/fix-cm.pdfbin262059 -> 261622 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/fntguide.pdfbin417861 -> 418347 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/fntguide.tex18
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/graphpap.pdfbin156277 -> 156276 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ifthen.pdfbin205213 -> 204833 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/inputenc.pdfbin294900 -> 294928 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/latexchanges.pdfbin232390 -> 247704 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/latexchanges.tex99
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/latexrelease.pdfbin246195 -> 245786 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/latexsym.pdfbin192297 -> 192295 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/lb2.pdfbin138219 -> 138221 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/letter.pdfbin305670 -> 307271 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/lgc2.pdfbin101343 -> 101335 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/lppl.pdfbin125830 -> 125830 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltfilehook-code.pdfbin735387 -> 747843 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltfilehook-doc.pdfbin516316 -> 518920 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/lthooks-code.pdfbin901850 -> 929157 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/lthooks-doc.pdfbin621011 -> 626773 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltluatex.pdfbin305339 -> 305260 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews.pdfbin993090 -> 996577 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews01.pdfbin150020 -> 150020 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews01.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews02.pdfbin134751 -> 134751 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews02.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews03.pdfbin134742 -> 134739 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews03.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews04.pdfbin128772 -> 128773 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews04.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews05.pdfbin157181 -> 157182 bytes
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-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews06.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews07.pdfbin124029 -> 124030 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews07.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews08.pdfbin144482 -> 144483 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews08.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews09.pdfbin120222 -> 120221 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews09.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews10.pdfbin147946 -> 147944 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews10.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews11.pdfbin104936 -> 104939 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews11.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews12.pdfbin137919 -> 137922 bytes
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-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews14.pdfbin150907 -> 150913 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews14.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews15.pdfbin122092 -> 122092 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews15.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews16.pdfbin130687 -> 130689 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews16.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews17.pdfbin149838 -> 149848 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews17.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews18.pdfbin36005 -> 36004 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews18.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews19.pdfbin235073 -> 235075 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews19.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews20.pdfbin283318 -> 283324 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews21.pdfbin233492 -> 233489 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews22.pdfbin302836 -> 302831 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews22.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews23.pdfbin274459 -> 274456 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews23.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews24.pdfbin252645 -> 252643 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews24.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews25.pdfbin196326 -> 196325 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews25.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews26.pdfbin362839 -> 362839 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews26.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews27.pdfbin239758 -> 239759 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews27.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews28.pdfbin368226 -> 368231 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews28.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews29.pdfbin433004 -> 433003 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews29.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews30.pdfbin491246 -> 491245 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews31.pdfbin500919 -> 500928 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews32.pdfbin520923 -> 520917 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews33.pdfbin229842 -> 325333 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltnews33.tex60
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltshipout-code.pdfbin749381 -> 756536 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltshipout-doc.pdfbin503894 -> 528458 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltx3info.pdfbin191527 -> 191531 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltx3info.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/ltxdoc.pdfbin215102 -> 215243 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/makeindx.pdfbin160667 -> 160668 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/manifest.txt1
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/manual.pdfbin151347 -> 151352 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/modguide.pdfbin220388 -> 220389 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/modguide.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/nfssfont.pdfbin202451 -> 202445 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/proc.pdfbin216877 -> 216401 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/slides.pdfbin351586 -> 351910 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/slifonts.pdfbin214710 -> 214706 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/source2e.pdfbin4350850 -> 4392016 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/source2e.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/syntonly.pdfbin181372 -> 181871 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/tlc2.pdfbin164947 -> 164952 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/tulm.pdfbin156546 -> 156546 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/usrguide.pdfbin399035 -> 399074 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/usrguide.tex2
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/usrguide3.pdfbin0 -> 181816 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/usrguide3.tex701
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/utf8ienc.pdfbin330849 -> 330863 bytes
-rw-r--r--Master/texmf-dist/doc/latex-dev/base/webcomp.pdfbin136159 -> 136162 bytes
122 files changed, 1067 insertions, 60 deletions
diff --git a/Master/texmf-dist/doc/latex-dev/base/README.md b/Master/texmf-dist/doc/latex-dev/base/README.md
index 9a2a2436892..670f7eaa07f 100644
--- a/Master/texmf-dist/doc/latex-dev/base/README.md
+++ b/Master/texmf-dist/doc/latex-dev/base/README.md
@@ -1,7 +1,7 @@
The LaTeX kernel
================
-Release 2021-05-01 pre-release 0
+Release 2021-05-01 pre-release 1
Overview
--------
diff --git a/Master/texmf-dist/doc/latex-dev/base/alltt.pdf b/Master/texmf-dist/doc/latex-dev/base/alltt.pdf
index 24ec82b17c0..3c889b299a3 100644
--- a/Master/texmf-dist/doc/latex-dev/base/alltt.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/alltt.pdf
Binary files differ
diff --git a/Master/texmf-dist/doc/latex-dev/base/cfgguide.pdf b/Master/texmf-dist/doc/latex-dev/base/cfgguide.pdf
index 8826a946867..8171183a8eb 100644
--- a/Master/texmf-dist/doc/latex-dev/base/cfgguide.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/cfgguide.pdf
Binary files differ
diff --git a/Master/texmf-dist/doc/latex-dev/base/cfgguide.tex b/Master/texmf-dist/doc/latex-dev/base/cfgguide.tex
index 84cde10c84f..048f4f4ef5e 100644
--- a/Master/texmf-dist/doc/latex-dev/base/cfgguide.tex
+++ b/Master/texmf-dist/doc/latex-dev/base/cfgguide.tex
@@ -1,6 +1,6 @@
% \iffalse meta-comment
%
-% Copyright (C) 1993-2020
+% Copyright (C) 1993-2021
% The LaTeX3 Project and any individual authors listed elsewhere
% in this file.
%
diff --git a/Master/texmf-dist/doc/latex-dev/base/changes.txt b/Master/texmf-dist/doc/latex-dev/base/changes.txt
index 6d70494baaf..bdb299ae3c0 100644
--- a/Master/texmf-dist/doc/latex-dev/base/changes.txt
+++ b/Master/texmf-dist/doc/latex-dev/base/changes.txt
@@ -6,10 +6,186 @@ completeness or accuracy and it contains some references to files that
are not part of the distribution.
================================================================================
+2020-12-22 Frank Mittelbach <Frank.Mittelbach@latex-project.org>
+
+ * ltfssaxes.dtx (subsection{Changing to a new series}):
+ Distangle series and shape update by delaying the font series
+ and font shape merging (gh/444)
+
+ Move the rollback info for \normalshape after its main definition
+ otherwise it will not be undone (gh/458)
+
+2020-12-22 Frank Mittelbach <Frank.Mittelbach@latex-project.org>
+
+ * ltfsstrc.dtx (subsection{General font loading}):
+ Alter \selectfont to do the delayed merging of font series
+ and font shape (gh/444)
+
+2020-12-27 Frank Mittelbach <Frank.Mittelbach@latex-project.org>
+
+ * letter.dtx (subsubsection{Page breaking control}):
+ The \opening argument was splitting name and address using \\
+ but did not allow to use \\[...] for this (gh/427)
+
+2020-12-10 Frank Mittelbach <Frank.Mittelbach@latex-project.org>
+
+ * ltbibl.dtx (section{Bibliography Generation}):
+ Delay any \cs{nocite} in the preamble instead of raising
+ an error (gh/424)
+
+2020-12-06 Johannes Braams <Johannes.Braams@latex-project.org>
+
+ * miscelaneous files: gh/428, gh/429 and gh/430 list a number of
+ typing mistakes and missing documentation that have crept in over
+ the years. The following files were affected and have been
+ corrected:
+ alltt.dtx, classes.dtx, doc.dtx, docstrip.dtx, fix-cm.dtx,
+ fontdef.dtx, ifthen.dtx, inputenc.dtx, latex209.dtx,
+ latexrelease.dtx, ltbibl.dtx, ltboxes.dtx, ltclass.dtx,
+ ltcntrl.dtx, ltcounts.dtx, ltdefns.dtx, ltdirchk.dtx, ltexpl.dtx,
+ ltfilehook.dtx, ltfiles.dtx, ltfinal.dtx, ltfloat.dtx,
+ ltfntcmd.dtx, ltfssaxes.dtx, ltfssbas.dtx, ltfsscmp.dtx,
+ ltfssdcl.dtx, ltfssini.dtx, ltfsstrc.dtx, lthooks.dtx,
+ ltlength.dtx, ltlists.dtx, ltluatex.dtx, ltmath.dtx, ltmiscen.dtx,
+ ltoutenc.dtx, ltoutput.dtx, ltpage.dtx, ltpageno.dtx,
+ ltpictur.dtx, ltplain.dtx, ltsect.dtx, ltshipout.dtx,
+ lttextcomp.dtx, ltvers.dtx, ltxdoc.dtx, ltxref.dtx, nfssfont.dtx,
+ proc.dtx, slides.dtx, utf8ienc.dtx.
+
+2020-12-04 Frank Mittelbach <Frank.Mittelbach@latex-project.org>
+
+ * ltfilehook.dtx (subsection{Declaring a file substitution}):
+ Don't drop file substitution declarations when rolling back
+ just render them no-ops
+
+2020-12-04 Frank Mittelbach <Frank.Mittelbach@latex-project.org>
+ Add a hook to \selectfont to be executed after the switch to the
+ new font. This implements the functionality formerly in the everysel
+ package.
+
+2020-12-04 Frank Mittelbach <Frank.Mittelbach@latex-project.org>
+
+ * ltfinal.dtx (subsection{File substitutions}):
+ Emulate everysel package
+
+2020-12-04 Frank Mittelbach <Frank.Mittelbach@latex-project.org>
+
+ * ltfssini.dtx (subsection{Miscellaneous}):
+ Setting up \f@series and \f@shape default values directly (gh/444)
+
+2020-11-23 Frank Mittelbach <Frank.Mittelbach@latex-project.org>
+
+ * ltshipout.dtx:
+ Check for both kernel and user hooks and execute if either is non-empty (gh/431)}
+
+2020-10-26 Frank Mittelbach <Frank.Mittelbach@latex-project.org>
+
+ * ltmiscen.dtx (subsection{Environments}):
+ \enddocument should always start out in vmode (gh/385)
+
================================================================================
All changes above are only part of the development branch for the next release.
================================================================================
+
+#########################
+# 2020-10-01 PL 4 Release
+#########################
+
+2021-01-07 Phelype Oleinik <phelype.oleinik@latex-project.org>
+
+ * ltfilehook.dtx:
+ Undefine \@expl@@@filehook@file@pop@@ to avoid error when rolling back (gh/463).
+
+ * lthooks.dtx:
+ Modified internal copies of l3tl commands to avoid errors with l3debug (gh/463).
+
+2020-12-18 Phelype Oleinik <phelype.oleinik@latex-project.org>
+
+ * lthooks.dtx:
+ Preserve trailing slash in file hook name if the file name is empty (gh/464).
+
+ * ltfilehook.dtx:
+ Restore \CurrentFile(Path)(Used) after the file is input (gh/464).
+
+2020-12-03 Joseph Wright <Joseph.Wright@latex-project.org>
+
+ * usrguide3.tex
+ New file to cover creation of document commands
+
+
+#########################
+# 2020-10-01 PL 3 Release
+#########################
+
+2020-12-18 Phelype Oleinik <phelype.oleinik@latex-project.org>
+
+ * lthooks.dtx:
+ Moved 'top-level' code label at the very end of hooks.
+ - In reverse hooks, 'top-level' goes at the beginning.
+ - 'top-level' cannot be used as a label outside of the top-level.
+ - The label for the 'top-level' cannot be changed.
+ - Simplified internal managing of default label.
+ Renamed \DeclareDefaultHookLabel to \SetDefaultHookLabel (the old name
+ will be kept until the next release).
+ Provide \PushDefaultHookLabel and \PopDefaultHookLabel.
+ Fixed a small bug in \ShowHook and \LogHook.
+
+ * ltclass.dtx:
+ Remove \@expl@@@hook@curr@name@push@@n from \@pushfilename to
+ follow changes to lthooks.dtx.
+
+2020-12-10 Frank Mittelbach <Frank.Mittelbach@latex-project.org>
+
+ * ltfssbas.dtx (subsection{Macros for the user}):
+ Drop ``m'' if the series value is a member of a fixed list
+ and issue warning if doing it (gh/453)
+
+2020-11-24 Frank Mittelbach <Frank.Mittelbach@latex-project.org>
+
+ * latexrelease.ins:
+ reorder module loading to match the order used
+ in the format to correctly resolve dependencies (gh/434)
+
+ * ltexpl.dtx (subsection{Loader}):
+ Load xparse in latexrelease if necessary and add missing
+ IncludeInRelease guards (gh/434)
+
+ * ltdefns.dtx, ltfilehook.dtx, lthooks.dtx, ltxshipout.dtx:
+ Add rollback support for forward case (gh/434)
+
+2020-11-20 Phelype Oleinik <phelype.oleinik@latex-project.org>
+
+ * ltclass.dtx:
+ Remove file path from \@currname and use only \@currname to identify
+ a package internally (gh/422).
+ Add \@currpath and (temporarily) \@kernel@currpathstack.
+ In \ProvidesPackage check the argument with \strcmp instead of \ifx.
+ In case of substitution, copy the option list to the requested package.
+
+ * ltfilehook.dtx:
+ Keep path in the replacement file (#2) in \declare@file@substitution.
+ In case of a replacement, pass the actually loaded file to \@addtofilelist.
+ Explicitly clear replacement flag after using it.
+
+2020-11-17 Frank Mittelbach <Frank.Mittelbach@latex-project.org>
+
+ * fntguide.tex:
+ Updated documentation of virtual shapes \updefault and \ulcdefault
+
+2020-11-09 Frank Mittelbach <Frank.Mittelbach@latex-project.org>
+
+ * ltmath.dtx:
+ \negmedspace and \negthickspace have been only in amsmath,
+ so we need to undefine for rollback because amsmath used
+ \newcommand back then (gh/423)
+
+2020-11-09 Frank Mittelbach <Frank.Mittelbach@latex-project.org>
+
+ * ltclass.dtx (section{Package/class rollback mechanism}):
+ Change help text for suspicous rollback, because the package may have
+ existed then --- there is just no rollback data (gh/423)
+
#########################
# 2020-10-01 PL 2 Release
#########################
diff --git a/Master/texmf-dist/doc/latex-dev/base/classes.pdf b/Master/texmf-dist/doc/latex-dev/base/classes.pdf
index 36bf46d8cc0..7c2a8a111c8 100644
--- a/Master/texmf-dist/doc/latex-dev/base/classes.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/classes.pdf
Binary files differ
diff --git a/Master/texmf-dist/doc/latex-dev/base/clsguide.pdf b/Master/texmf-dist/doc/latex-dev/base/clsguide.pdf
index 8aa406713f8..bf272bfaaec 100644
--- a/Master/texmf-dist/doc/latex-dev/base/clsguide.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/clsguide.pdf
Binary files differ
diff --git a/Master/texmf-dist/doc/latex-dev/base/clsguide.tex b/Master/texmf-dist/doc/latex-dev/base/clsguide.tex
index d778bf9ff4c..57f4b2fd79e 100644
--- a/Master/texmf-dist/doc/latex-dev/base/clsguide.tex
+++ b/Master/texmf-dist/doc/latex-dev/base/clsguide.tex
@@ -1,6 +1,6 @@
% \iffalse meta-comment
%
-% Copyright (C) 1993-2020
+% Copyright (C) 1993-2021
% The LaTeX3 Project and any individual authors listed elsewhere
% in this file.
%
diff --git a/Master/texmf-dist/doc/latex-dev/base/cmfonts.pdf b/Master/texmf-dist/doc/latex-dev/base/cmfonts.pdf
index e9e304bf201..7ca95155089 100644
--- a/Master/texmf-dist/doc/latex-dev/base/cmfonts.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/cmfonts.pdf
Binary files differ
diff --git a/Master/texmf-dist/doc/latex-dev/base/cyrguide.pdf b/Master/texmf-dist/doc/latex-dev/base/cyrguide.pdf
index c078b7aaf48..6ff92200632 100644
--- a/Master/texmf-dist/doc/latex-dev/base/cyrguide.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/cyrguide.pdf
Binary files differ
diff --git a/Master/texmf-dist/doc/latex-dev/base/cyrguide.tex b/Master/texmf-dist/doc/latex-dev/base/cyrguide.tex
index 44c30b1153f..89c5a56b7f0 100644
--- a/Master/texmf-dist/doc/latex-dev/base/cyrguide.tex
+++ b/Master/texmf-dist/doc/latex-dev/base/cyrguide.tex
@@ -1,6 +1,6 @@
% \iffalse meta-comment
%
-% Copyright (C) 1993-2020
+% Copyright (C) 1993-2021
% The LaTeX3 Project and any individual authors listed elsewhere
% in this file.
%
diff --git a/Master/texmf-dist/doc/latex-dev/base/doc.pdf b/Master/texmf-dist/doc/latex-dev/base/doc.pdf
index 59e323df71f..960e997adb2 100644
--- a/Master/texmf-dist/doc/latex-dev/base/doc.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/doc.pdf
Binary files differ
diff --git a/Master/texmf-dist/doc/latex-dev/base/docstrip.pdf b/Master/texmf-dist/doc/latex-dev/base/docstrip.pdf
index e4ccadef955..1b07721077c 100644
--- a/Master/texmf-dist/doc/latex-dev/base/docstrip.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/docstrip.pdf
Binary files differ
diff --git a/Master/texmf-dist/doc/latex-dev/base/encguide.pdf b/Master/texmf-dist/doc/latex-dev/base/encguide.pdf
index 374ac813898..fe668c7f930 100644
--- a/Master/texmf-dist/doc/latex-dev/base/encguide.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/encguide.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/encguide.tex b/Master/texmf-dist/doc/latex-dev/base/encguide.tex
index 339bce1eb33..aeb2f35037f 100644
--- a/Master/texmf-dist/doc/latex-dev/base/encguide.tex
+++ b/Master/texmf-dist/doc/latex-dev/base/encguide.tex
@@ -1,6 +1,6 @@
% \iffalse meta-comment
%
-% Copyright (C) 1993-2020
+% Copyright (C) 1993-2021
% The LaTeX3 Project and any individual authors listed elsewhere
% in this file.
%
diff --git a/Master/texmf-dist/doc/latex-dev/base/exscale.pdf b/Master/texmf-dist/doc/latex-dev/base/exscale.pdf
index d1a0b2ed803..52395da9049 100644
--- a/Master/texmf-dist/doc/latex-dev/base/exscale.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/exscale.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/fix-cm.pdf b/Master/texmf-dist/doc/latex-dev/base/fix-cm.pdf
index 138d239544d..1c1c03621a5 100644
--- a/Master/texmf-dist/doc/latex-dev/base/fix-cm.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/fix-cm.pdf
Binary files differ
diff --git a/Master/texmf-dist/doc/latex-dev/base/fntguide.pdf b/Master/texmf-dist/doc/latex-dev/base/fntguide.pdf
index 2548c0f2002..5cadeb9dfba 100644
--- a/Master/texmf-dist/doc/latex-dev/base/fntguide.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/fntguide.pdf
Binary files differ
diff --git a/Master/texmf-dist/doc/latex-dev/base/fntguide.tex b/Master/texmf-dist/doc/latex-dev/base/fntguide.tex
index b6576a02370..7a824d0a997 100644
--- a/Master/texmf-dist/doc/latex-dev/base/fntguide.tex
+++ b/Master/texmf-dist/doc/latex-dev/base/fntguide.tex
@@ -1,6 +1,6 @@
% \iffalse meta-comment
%
-% Copyright (C) 1993-2020
+% Copyright (C) 1993-2021
%
% The LaTeX3 Project and any individual authors listed elsewhere
% in this file.
@@ -42,7 +42,7 @@
newer NFSS features of 2020}\\
All rights reserved.}
-\date{July 2020}
+\date{November 2020}
\begin{document}
@@ -340,22 +340,25 @@ box warning, for example:
\end{verbatim}
The author commands for fonts set the five attributes:
\begin{center}
+ \hspace*{-1em}%
\begin{tabular}{rcl}
\emph{Author command} & \emph{Attribute}
& \emph{Value in} |article| \emph{class} \\
|\textnormal{..}| or |\normalfont| & family & |cmr| \\
+ & series & |m| \\
+ & shape & |n| \\[1pt]
|\textrm{..}| or |\rmfamily| & family & |cmr| \\
|\textsf{..}| or |\sffamily| & family & |cmss| \\
|\texttt{..}| or |\ttfamily| & family & |cmtt| \\
|\textmd{..}| or |\mdseries| & series & |m| \\
- |\textbf{..}| or |\bfseries| & series & |bx| \\
- |\textup{..}| or |\upshape| & shape & |n| \\
+ |\textbf{..}| or |\bfseries| & series & |bx| \\[1pt]
|\textit{..}| or |\itshape| & shape & |it| \\
|\textsl{..}| or |\slshape| & shape & |sl| \\
|\textsc{..}| or |\scshape| & shape & |sc| \\
|\textssc{..}| or |\sscshape| & shape & |ssc| \\
|\textsw{..}| or |\swshape| & shape & |sw| \\
- |\textulc{..}| or |\ulcshape| & shape & |ulc| \\
+ |\textulc{..}| or |\ulcshape| & shape & |ulc| (virtual) $\to$ |n|, |it|, |sl| or |ssc| \\
+ |\textup{..}| or |\upshape| & shape & |up| (virtual) $\to$ |n| or |sc| \\[1pt]
|\tiny| & size & |5pt| \\
|\scriptsize| & size & |7pt| \\
|\footnotesize| & size & |8pt| \\
@@ -520,8 +523,9 @@ and the |ssub| size function, see Section~\ref{sec:sizefunct}.
The shapes selected by |\textit|, |\itshape|, |\textsl|, |\slshape|,
|\textsc|, |\scshape|, |\textssc|, |\sscshape|, |\textsw|, |\swshape|,
|\textulc|, |\ulcshape|, |\textup| and |\upshape|. By default these are
-|it|, |sl|, |sc|, |ssc|, |sw|, |ulc| and |n|. |ulc| is special here
-since it is a virtual one; it doesn't exist as a real shape. The
+|it|, |sl|, |sc|, |ssc|, |sw|, |ulc| and |up|. Note that |ulc| and |up| are special here
+because they are virtual shapes; they don't exist as real shape values. Instead they alter
+the existing shape value based on rules, i.e., the result depends on context. The
respective macros |\textulc| or |\ulcshape| change small capitals back
to upper/lower case but will not change the font with respect to
italics, slanted or swash. |\upshape| or |\textup| in contrast will
diff --git a/Master/texmf-dist/doc/latex-dev/base/graphpap.pdf b/Master/texmf-dist/doc/latex-dev/base/graphpap.pdf
index 5066c175877..b7cba8a565d 100644
--- a/Master/texmf-dist/doc/latex-dev/base/graphpap.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/graphpap.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/ifthen.pdf b/Master/texmf-dist/doc/latex-dev/base/ifthen.pdf
index 0cf88429049..a5263ace6bd 100644
--- a/Master/texmf-dist/doc/latex-dev/base/ifthen.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/ifthen.pdf
Binary files differ
diff --git a/Master/texmf-dist/doc/latex-dev/base/inputenc.pdf b/Master/texmf-dist/doc/latex-dev/base/inputenc.pdf
index e62e670ce81..e27e93c46e0 100644
--- a/Master/texmf-dist/doc/latex-dev/base/inputenc.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/inputenc.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/latexchanges.pdf b/Master/texmf-dist/doc/latex-dev/base/latexchanges.pdf
index c4730ac9f0f..0a86ec34c42 100644
--- a/Master/texmf-dist/doc/latex-dev/base/latexchanges.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/latexchanges.pdf
Binary files differ
diff --git a/Master/texmf-dist/doc/latex-dev/base/latexchanges.tex b/Master/texmf-dist/doc/latex-dev/base/latexchanges.tex
index dc8eb4be4eb..500baa66c23 100644
--- a/Master/texmf-dist/doc/latex-dev/base/latexchanges.tex
+++ b/Master/texmf-dist/doc/latex-dev/base/latexchanges.tex
@@ -1,6 +1,6 @@
% \iffalse meta-comment
%
-% Copyright (C) 2015-2020
+% Copyright (C) 2015-2021
% The LaTeX3 Project and any individual authors listed elsewhere
% in this file.
%
@@ -38,10 +38,10 @@
\title{Changes to the \LaTeXe{} format}
-\author{\copyright~Copyright 2015--2020, \LaTeX3 Project Team.\\
+\author{\copyright~Copyright 2015--2021, \LaTeX3 Project Team.\\
All rights reserved.}
-\date{2020-02-02}
+\date{2021-01-08}
% a few commands from doc
\newcommand\Lpack[1]{\mbox{\textsf{#1}}}
@@ -75,16 +75,15 @@
\url{https://tex.stackexchange.com/q/#1}}
\fi
-\begin{document}
-\maketitle
+\setcounter{tocdepth}{1} % don't show subsections
-\tableofcontents
-\newpage
+\begin{document}
-\section{Introduction}
+\maketitle
+\begin{abstract}
This document describes changes that were made to the
\LaTeX\ format since the 2014-05-01 \LaTeX\ releases.
@@ -99,13 +98,79 @@ As a summary of changes for a main release will always be available in
but changes in any patch releases will be listed in more
detail here.
-More detailed change logs are available as
+More detailed change logs are available as
\texttt{changes.txt} in the base distribution, and full code
differences may be browsed via the code repository on GitHub
see for example
\url{https://github.com/latex3/latex2e/commits/master}.
+\end{abstract}
+
+\tableofcontents
+
+\newpage
+
+%\section{Introduction}
+
+
+
+\section{Changes introduced in 2020-10-01 patch~4}
+
+This patch fixed two bugs in the hook management: if debugging for the
+L3 programming layer was turned on it reported inconsistent use of
+local/global variables. This was a spurious warning but nevertheless
+disconcerting (\ghissue{463}). The other bug was more serious, in some
+situations a wrong value of \verb=\CurrentFile= inside of file-related hooks
+could lead to errors (\ghissue{464}).
+
+We also added the documentation file \texttt{userguide3.pdf} which
+will become the main home for documenting new features of \LaTeX. At
+this point in time it covers the \Lpack{xparse} functionality that has
+been added to the kernel.
+
+\section{Changes introduced in 2020-10-01 patch~3}
+
+This patch fixed some rollback issues that prevented successful
+rollback to other release levels in some cases. It also fixed an issue
+with file hooks involving files with explicit paths (\ghissue{422}).
+
+One important change was to handle hook declarations done in the
+document preamble in a special way, e.g., those done with
+\verb=\AtBeginDocument=. They are now always executed last and are not
+subject to the normal code sorting for hooks, because they are nearly always
+needed to overwrite earlier settings made in packages.
+
+Finally, the NFSS series handling was slightly changed to
+automatically drop surplus ``\texttt{m}''s from series specifications
+when needed (and warn about them when encountered), e.g.,
+``\texttt{mc}'' automatically becomes ``\texttt{c}'' which is the
+official NFSS name for a \emph{medium compact} series (\ghissue{453}).
+This was done to improve the fix in 2020-02-02 PL~5.
+
+\section{Changes introduced in 2020-10-01 patch~2}
+
+This patch fixed the passing of options to packages and classes when
+they are stored in a special place (denoted by \verb=\input@path=)
+instead of their normal location (\ghissue{414}). In that case the
+options got lost.
+
+\section{Changes introduced in 2020-10-01 patch~1}
+
+This patch fixed a file handling issue: to allow for spaces in file
+names quotes were used but this upsets Bib\TeX{} (\ghissue{400}). In
+addition, two rollback issues got corrected.
+
+\section{Changes introduced in 2020-10-01}
+Major enhancements in this release include pre-loading of the
+\Lpack{xparse} package for producing document-level commands with more
+complicated argument signatures and the new hook management system for
+\LaTeX{} documented in \texttt{lthooks-doc.pdf},
+\texttt{ltfilehook-doc.pdf} and \texttt{ltshipout-doc.pdf}.
+In addition there have been many smaller fixes and enhancements.
+Please see \ltnewsissue{32} for an overview of the new features and
+the change log in \texttt{changes.txt} for a more detailed list of
+individual changes.
\section{Changes introduced in 2020-02-02 patch~5}
@@ -167,7 +232,7 @@ Major enhancements in this release include pre-loading \Lpack{expl3}
to improve startup times, especially with Lua\TeX\ and Xe\TeX, and
extra features in the font selection mechanism. Please see
\ltnewsissue{31} for an overview of the new features and the change
-log in \texttt{changelog.txt} for a more detailed list of individual
+log in \texttt{changes.txt} for a more detailed list of individual
changes.
@@ -248,7 +313,7 @@ counter prefix commands \verb|p@...| so that they would take the counter
value as an argument instead of just acting as a prefix to them. These
packages also provided the \verb|\labelformat| macro to change the prefix
macro and \verb|\Ref| so that using counters defined that way in the
-beginning of sentences would have the proper capitalisation. These features
+beginning of sentences would have the proper capitalization. These features
were added to the \LaTeXe{} kernel.
The kernel now says ``Trying to load\ldots''
@@ -283,7 +348,7 @@ provided as alias for the names based on the Adobe font names
The use of potrusion in tables of contents is suppressed by default,
see \sxquestion{172785}.
-The handling of visible space in verbation was adjusted for
+The handling of visible space in verbatim was adjusted for
\ghissue{69} and \ghissue{70}.
Spaces are removed from the argument passed to BiBTeX, \ghissue{88}.
@@ -295,7 +360,7 @@ levels of split hyperlinks, avoiding a fatal pdftex error. \ghissue{94}.
\section{Changes introduced in 2018-04-01 patch~5}
-Improved support for non ASCII filenames on the commandline on
+Improved support for non ASCII filenames on the command line on
filesystems using legacy encodings.
Adjusted the new package rollback code so that some edge cases where rollback
@@ -344,11 +409,11 @@ Lua\TeX, now at 1.04.
Previously defining an encoding-specific composite with an undeclared
accent (or an accent declared later) gave no error, but did nothing useful.
-\LaTeX\ will now detect this and give the accent comamnd a default definition
+\LaTeX\ will now detect this and give the accent command a default definition
as an error, allowing the declared composite to work as intended.
The definition of \verb|\-| is adjusted to match the comments in
-\gnatsissue{3855} to accomodate non standard settings of \verb|\hyphenchar|.
+\gnatsissue{3855} to accommodate non standard settings of \verb|\hyphenchar|.
In parboxes and similar settings, \verb|\lineskiplimit| is now
reset (to the existing default value, \verb|\normallineskiplimit|).
@@ -409,7 +474,7 @@ Load Unicode data from new generic \texttt{unicode-data} distribution.
\section{Changes introduced in 2015/10/01 patch~2}
-This release fixes the behaviour of the allocation mechanism if the switch
+This release fixes the behavior of the allocation mechanism if the switch
from the standard to extended pool takes place within a group.
\section{Changes introduced in 2015/10/01 patch~1}
@@ -444,7 +509,7 @@ The command |\textcommabelow| has been added. This is mainly intended for Romani
\textcommabelow{S}\,\textcommabelow{s}\,\textcommabelow{T}\,\textcommabelow{t}.
\subsection{Unicode 8}
-The file |unicode-letters.def| used to initialise character data in
+The file |unicode-letters.def| used to initialize character data in
Unicode \TeX\ variants has been regenerated from data files updated
to Unicode~8.
diff --git a/Master/texmf-dist/doc/latex-dev/base/latexrelease.pdf b/Master/texmf-dist/doc/latex-dev/base/latexrelease.pdf
index 317c29c818a..a0c1c75aad6 100644
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index 4836c1bd883..54158158e33 100644
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index 4623628c0df..b37fec19fbb 100644
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+++ b/Master/texmf-dist/doc/latex-dev/base/ltluatex.pdf
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index 98b5f212653..1fad83e1e14 100644
--- a/Master/texmf-dist/doc/latex-dev/base/ltnews.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/ltnews.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/ltnews01.pdf b/Master/texmf-dist/doc/latex-dev/base/ltnews01.pdf
index 16feb5dff67..650b30ac91d 100644
--- a/Master/texmf-dist/doc/latex-dev/base/ltnews01.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/ltnews01.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/ltnews01.tex b/Master/texmf-dist/doc/latex-dev/base/ltnews01.tex
index c5d66f003ed..b8cff84839a 100644
--- a/Master/texmf-dist/doc/latex-dev/base/ltnews01.tex
+++ b/Master/texmf-dist/doc/latex-dev/base/ltnews01.tex
@@ -1,6 +1,6 @@
% \iffalse meta-comment
%
-% Copyright (C) 1993-2020
+% Copyright (C) 1993-2021
% The LaTeX3 Project and any individual authors listed elsewhere
% in this file.
%
diff --git a/Master/texmf-dist/doc/latex-dev/base/ltnews02.pdf b/Master/texmf-dist/doc/latex-dev/base/ltnews02.pdf
index e69431509bc..6be0c94845e 100644
--- a/Master/texmf-dist/doc/latex-dev/base/ltnews02.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/ltnews02.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/ltnews02.tex b/Master/texmf-dist/doc/latex-dev/base/ltnews02.tex
index b0e3d15be86..8051e595357 100644
--- a/Master/texmf-dist/doc/latex-dev/base/ltnews02.tex
+++ b/Master/texmf-dist/doc/latex-dev/base/ltnews02.tex
@@ -1,6 +1,6 @@
% \iffalse meta-comment
%
-% Copyright (C) 1993-2020
+% Copyright (C) 1993-2021
% The LaTeX3 Project and any individual authors listed elsewhere
% in this file.
%
diff --git a/Master/texmf-dist/doc/latex-dev/base/ltnews03.pdf b/Master/texmf-dist/doc/latex-dev/base/ltnews03.pdf
index 6d6ca8f0b59..b8d7f44886f 100644
--- a/Master/texmf-dist/doc/latex-dev/base/ltnews03.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/ltnews03.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/ltnews03.tex b/Master/texmf-dist/doc/latex-dev/base/ltnews03.tex
index 0496843f0d7..cb5776eaafe 100644
--- a/Master/texmf-dist/doc/latex-dev/base/ltnews03.tex
+++ b/Master/texmf-dist/doc/latex-dev/base/ltnews03.tex
@@ -1,6 +1,6 @@
% \iffalse meta-comment
%
-% Copyright (C) 1993-2020
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diff --git a/Master/texmf-dist/doc/latex-dev/base/ltnews31.pdf b/Master/texmf-dist/doc/latex-dev/base/ltnews31.pdf
index 437e0e30c25..93104e511e9 100644
--- a/Master/texmf-dist/doc/latex-dev/base/ltnews31.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/ltnews31.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/ltnews32.pdf b/Master/texmf-dist/doc/latex-dev/base/ltnews32.pdf
index 9b7f223680b..6dceda4651a 100644
--- a/Master/texmf-dist/doc/latex-dev/base/ltnews32.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/ltnews32.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/ltnews33.pdf b/Master/texmf-dist/doc/latex-dev/base/ltnews33.pdf
index 2d24a7aa7aa..ec075df271c 100644
--- a/Master/texmf-dist/doc/latex-dev/base/ltnews33.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/ltnews33.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/ltnews33.tex b/Master/texmf-dist/doc/latex-dev/base/ltnews33.tex
index daa8fc69e8c..f3341e7a996 100644
--- a/Master/texmf-dist/doc/latex-dev/base/ltnews33.tex
+++ b/Master/texmf-dist/doc/latex-dev/base/ltnews33.tex
@@ -114,8 +114,68 @@
\section{Other changes to the \LaTeX{} kernel}
+\subsection{\cs{end}\texttt{\textbraceleft document\textbraceright}
+ should always start in v-mode}
+
+Until now \verb=\end{document}= executed the code from the
+\cs{AtEndDocument} hook as its first action. This meant that it was
+executed in horizontal mode if the user left no empty line after the
+last paragraph. As a result one could get a spurious space added, for
+example, when that code contained a \cs{write} statement. This was
+fixed and now \cs{enddocument} first issues a \cs{par} to ensure that
+it always starts out in vertical mode.
+%
+\githubissue{385}
+
+
+
+\subsection{Allow extra space between name and address in \pkg{letter} class}
+
+The \cs{opening} command in the the \pkg{letter} class expects the
+name and address to be separated by \verb=\\= but it didn't allow to
+use an optional argument at this point to add some extra space after
+the name. The coding has now been slightly altered to allow for this.
+%
+\githubissue{427}
+
+
+
+\subsection{Provide hook in \cs{selectfont}}
+
+After \cs{selectfont} has altered the font we run a hook so that
+packages can make final adjustments. This functionality was originally
+provided by the \pkg{everysel} package, the new implementation is
+slightly different and uses the standard hook management.
+%
+\githubissue{444}
+
+
+\subsection{Delay change of font series and shape to \cs{selectfont} call}
+
+With the NFSS extensions introduced in 2020 the font series and shape
+settings be be influenced by changes to the font family. The setting
+is therefore delayed until \cs{selectfont} is executed to avoid
+unnecessary or incorrect substitutions that may otherwise happen due
+to the order of declarations.
+%
+\githubissue{444}
+
+
+
+\subsection{Allow \cs{nocite} in preamble}
+
+A natural place for \verb=\nocite{*}= would be the preamble of the
+document, but for historical reasons \LaTeX{} issued an error message
+if it was placed there. From the new release on it is now allowed in
+the preamble.
+%
+\githubissue{424}
+
+
+
\subsection{\ldots}
+\emph{to be written}
%
\githubissue{xxx}
diff --git a/Master/texmf-dist/doc/latex-dev/base/ltshipout-code.pdf b/Master/texmf-dist/doc/latex-dev/base/ltshipout-code.pdf
index ef222addc50..7c92232d137 100644
--- a/Master/texmf-dist/doc/latex-dev/base/ltshipout-code.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/ltshipout-code.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/ltshipout-doc.pdf b/Master/texmf-dist/doc/latex-dev/base/ltshipout-doc.pdf
index f49022e979e..384a4a09f15 100644
--- a/Master/texmf-dist/doc/latex-dev/base/ltshipout-doc.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/ltshipout-doc.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/ltx3info.pdf b/Master/texmf-dist/doc/latex-dev/base/ltx3info.pdf
index 5297943248f..62baa687829 100644
--- a/Master/texmf-dist/doc/latex-dev/base/ltx3info.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/ltx3info.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/ltx3info.tex b/Master/texmf-dist/doc/latex-dev/base/ltx3info.tex
index ccb4e0ed99c..b786a1f622f 100644
--- a/Master/texmf-dist/doc/latex-dev/base/ltx3info.tex
+++ b/Master/texmf-dist/doc/latex-dev/base/ltx3info.tex
@@ -1,6 +1,6 @@
% \iffalse meta-comment
%
-% Copyright (C) 1993-2020
+% Copyright (C) 1993-2021
% The LaTeX3 Project and any individual authors listed elsewhere
% in this file.
%
diff --git a/Master/texmf-dist/doc/latex-dev/base/ltxdoc.pdf b/Master/texmf-dist/doc/latex-dev/base/ltxdoc.pdf
index 2d6bf602117..4c74c8d46b6 100644
--- a/Master/texmf-dist/doc/latex-dev/base/ltxdoc.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/ltxdoc.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/makeindx.pdf b/Master/texmf-dist/doc/latex-dev/base/makeindx.pdf
index ed8e4b1a163..a23fd5ccd50 100644
--- a/Master/texmf-dist/doc/latex-dev/base/makeindx.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/makeindx.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/manifest.txt b/Master/texmf-dist/doc/latex-dev/base/manifest.txt
index f3c8f2b2165..0cf27343c13 100644
--- a/Master/texmf-dist/doc/latex-dev/base/manifest.txt
+++ b/Master/texmf-dist/doc/latex-dev/base/manifest.txt
@@ -38,6 +38,7 @@
% fntguide.tex -- Guide to font selection.
% modguide.tex -- Guide to modifying and distributing LaTeX.
% usrguide.tex -- User guide for this release.
+% usrguide3.tex -- User guide for expl3-based methods.
%
% ltnews01.tex -- What was new in the release dated 1994/06.
% ltnews02.tex -- What was new in the release dated 1994/12.
diff --git a/Master/texmf-dist/doc/latex-dev/base/manual.pdf b/Master/texmf-dist/doc/latex-dev/base/manual.pdf
index a154a9d08b8..8d00af366ac 100644
--- a/Master/texmf-dist/doc/latex-dev/base/manual.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/manual.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/modguide.pdf b/Master/texmf-dist/doc/latex-dev/base/modguide.pdf
index a42431033dd..ae7a44a56dd 100644
--- a/Master/texmf-dist/doc/latex-dev/base/modguide.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/modguide.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/modguide.tex b/Master/texmf-dist/doc/latex-dev/base/modguide.tex
index 33af973d29b..5374094e8ba 100644
--- a/Master/texmf-dist/doc/latex-dev/base/modguide.tex
+++ b/Master/texmf-dist/doc/latex-dev/base/modguide.tex
@@ -1,6 +1,6 @@
% \iffalse meta-comment
%
-% Copyright (C) 1993-2020
+% Copyright (C) 1993-2021
% The LaTeX3 Project and any individual authors listed elsewhere
% in this file.
%
diff --git a/Master/texmf-dist/doc/latex-dev/base/nfssfont.pdf b/Master/texmf-dist/doc/latex-dev/base/nfssfont.pdf
index e4f79bfb28f..d2a17482d6e 100644
--- a/Master/texmf-dist/doc/latex-dev/base/nfssfont.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/nfssfont.pdf
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index d4f684df929..1fdce920aa2 100644
--- a/Master/texmf-dist/doc/latex-dev/base/proc.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/proc.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/slides.pdf b/Master/texmf-dist/doc/latex-dev/base/slides.pdf
index bf548d02d1b..14519c05304 100644
--- a/Master/texmf-dist/doc/latex-dev/base/slides.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/slides.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/slifonts.pdf b/Master/texmf-dist/doc/latex-dev/base/slifonts.pdf
index 87f25b58b5c..e0b6be9b942 100644
--- a/Master/texmf-dist/doc/latex-dev/base/slifonts.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/slifonts.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/source2e.pdf b/Master/texmf-dist/doc/latex-dev/base/source2e.pdf
index 0f4add9b45f..de20a00439a 100644
--- a/Master/texmf-dist/doc/latex-dev/base/source2e.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/source2e.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/source2e.tex b/Master/texmf-dist/doc/latex-dev/base/source2e.tex
index e74c424d729..ad6f5c9fb01 100644
--- a/Master/texmf-dist/doc/latex-dev/base/source2e.tex
+++ b/Master/texmf-dist/doc/latex-dev/base/source2e.tex
@@ -1,6 +1,6 @@
% \iffalse meta-comment
%
-% Copyright (C) 1993-2020
+% Copyright (C) 1993-2021
% The LaTeX3 Project and any individual authors listed elsewhere
% in this file.
%
diff --git a/Master/texmf-dist/doc/latex-dev/base/syntonly.pdf b/Master/texmf-dist/doc/latex-dev/base/syntonly.pdf
index 1209fd46f17..6e2933bdd49 100644
--- a/Master/texmf-dist/doc/latex-dev/base/syntonly.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/syntonly.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/tlc2.pdf b/Master/texmf-dist/doc/latex-dev/base/tlc2.pdf
index 6a75621960d..e6f27b0a5a4 100644
--- a/Master/texmf-dist/doc/latex-dev/base/tlc2.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/tlc2.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/tulm.pdf b/Master/texmf-dist/doc/latex-dev/base/tulm.pdf
index 8f1308891d3..c4319f500a5 100644
--- a/Master/texmf-dist/doc/latex-dev/base/tulm.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/tulm.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/usrguide.pdf b/Master/texmf-dist/doc/latex-dev/base/usrguide.pdf
index be2b3a11a77..42b3dba05b2 100644
--- a/Master/texmf-dist/doc/latex-dev/base/usrguide.pdf
+++ b/Master/texmf-dist/doc/latex-dev/base/usrguide.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/usrguide.tex b/Master/texmf-dist/doc/latex-dev/base/usrguide.tex
index 4c2ddf24af6..a51bb438551 100644
--- a/Master/texmf-dist/doc/latex-dev/base/usrguide.tex
+++ b/Master/texmf-dist/doc/latex-dev/base/usrguide.tex
@@ -1,6 +1,6 @@
% \iffalse meta-comment
%
-% Copyright (C) 1993-2020
+% Copyright (C) 1993-2021
% The LaTeX3 Project and any individual authors listed elsewhere
% in this file.
%
diff --git a/Master/texmf-dist/doc/latex-dev/base/usrguide3.pdf b/Master/texmf-dist/doc/latex-dev/base/usrguide3.pdf
new file mode 100644
index 00000000000..59db944a75d
--- /dev/null
+++ b/Master/texmf-dist/doc/latex-dev/base/usrguide3.pdf
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diff --git a/Master/texmf-dist/doc/latex-dev/base/usrguide3.tex b/Master/texmf-dist/doc/latex-dev/base/usrguide3.tex
new file mode 100644
index 00000000000..40ef882fba9
--- /dev/null
+++ b/Master/texmf-dist/doc/latex-dev/base/usrguide3.tex
@@ -0,0 +1,701 @@
+% \iffalse meta-comment
+%
+% Copyright (C) 2020,2021
+% The LaTeX3 Project and any individual authors listed elsewhere
+% in this file.
+%
+% This file is part of the LaTeX base system.
+% -------------------------------------------
+%
+% It may be distributed and/or modified under the
+% conditions of the LaTeX Project Public License, either version 1.3c
+% of this license or (at your option) any later version.
+% The latest version of this license is in
+% http://www.latex-project.org/lppl.txt
+% and version 1.3c or later is part of all distributions of LaTeX
+% version 2008 or later.
+%
+% This file has the LPPL maintenance status "maintained".
+%
+% The list of all files belonging to the LaTeX base distribution is
+% given in the file `manifest.txt'. See also `legal.txt' for additional
+% information.
+%
+% The list of derived (unpacked) files belonging to the distribution
+% and covered by LPPL is defined by the unpacking scripts (with
+% extension .ins) which are part of the distribution.
+%
+% \fi
+% Filename: usrguide3.tex
+
+\documentclass{ltxguide}
+
+\usepackage[T1]{fontenc} % needed for \textbackslash in tt
+
+\title{\LaTeX3 methods for authors}
+\author{\copyright~Copyright 2020, \LaTeX\ Project Team.\\
+ All rights reserved.}
+
+\date{Released 2020-12-02}
+
+\NewDocumentCommand\cs{m}{\texttt{\textbackslash\detokenize{#1}}}
+\NewDocumentCommand\marg{m}{\arg{#1}}
+\NewDocumentCommand\meta{m}{\ensuremath{\langle}\textit{#1}\ensuremath{\rangle}}
+\NewDocumentCommand\pkg{m}{\textsf{#1}}
+\NewDocumentCommand\text{m}{\ifmmode\mbox{#1}\else#1\fi}
+% Fix a 'feature'
+\makeatletter
+\renewcommand \verbatim@font {\normalfont \ttfamily}
+\makeatother
+
+\begin{document}
+
+\maketitle
+
+\tableofcontents
+
+\section{Introduction}
+
+\LaTeXe{} was released in 1994 and added a number of then-new concepts to
+\LaTeX{}. These are described in \texttt{usrguide}, which has largely remained
+unchanged. Since then, the \LaTeX{} team have worked on a number of ideas,
+firstly a programming language for \LaTeX{} (\pkg{expl3}) and then a range of
+tools for document authors which build on that language. Here, we describe
+\emph{stable} and \emph{widely-usable} concepts that have resulted from that
+work. These `new' ideas have been transferred from development packages
+into the \LaTeXe{} kernel. As such, they are now available to \emph{all}
+\LaTeX{} users and have the \emph{same stability} as any other part of the
+kernel. The fact that `behind the scenes' they are built on \pkg{expl3}
+is useful for the development team, but is not directly important to users.
+
+\section{Creating document commands and environments}
+
+\subsection{Overview}
+
+Creating document commands and environments using the \LaTeX3 toolset is based
+around the idea that a common set of descriptions can be used to cover almost
+all argument types used in real documents. Thus parsing is reduced to a simple
+description of which arguments a command takes: this description provides the
+`glue' between the document syntax and the implementation of the
+command.
+
+First, we will describe the argument types, then move on to explain how these
+can be used to create both document commands and environments. Various more
+specialized features are then described, which allow an even richer application
+of a simple interface set up.
+
+The details here are intended to help users create document commands in
+general. More technical detail, suitable for \TeX{} programmers, is included
+in \texttt{interface3}.
+
+\subsection{Describing argument types}
+
+In order to allow each argument to be defined independently, the parser does
+not simply need to know the number of arguments for a function, but also the
+nature of each one. This is done by constructing an \emph{argument
+specification}, which defines the number of arguments, the type of each
+argument and any additional information needed for the parser to read the user
+input and properly pass it through to internal functions.
+
+The basic form of the argument specifier is a list of letters, where each
+letter defines a type of argument. As will be described below, some of the
+types need additional information, such as default values. The argument types
+can be divided into two, those which define arguments that are mandatory
+(potentially raising an error if not found) and those which define optional
+arguments. The mandatory types
+\begin{itemize}
+ \item[\texttt{m}] A standard mandatory argument, which can either be a single token
+ alone or multiple tokens surrounded by curly braces |{}|. Regardless of the
+ input, the argument will be passed to the internal code without the outer
+ braces. This is the type specifier for a normal \TeX{} argument.
+ \item[\texttt{r}] Given as \texttt{r}\meta{token1}\meta{token2}, this denotes a
+ `required' delimited argument, where the delimiters are
+ \meta{token1} and \meta{token2}. If the opening delimiter \meta{token1} is
+ missing, the default marker |-NoValue-| will be inserted after a suitable
+ error.
+ \item[\texttt{R}] Given as \texttt{R}\meta{token1}\meta{token2}\marg{default},
+ this is a `required' delimited argument as for~\texttt{r},
+ but it has a user-definable recovery \meta{default} instead of
+ |-NoValue-|.
+ \item[\texttt{v}] Reads an argument `verbatim', between the following
+ character and its next occurrence, in a way similar to the argument
+ of the \LaTeXe{} command \cs{verb}. Thus a \texttt{v}-type argument
+ is read between two identical characters, which cannot be any of |%|, |\|,
+ |#|, |{|, |}| or \verb*| |. The verbatim argument can also be enclosed
+ between braces, |{| and |}|. A command with a verbatim argument will
+ produce an error when it appears within an argument of another function.
+ \item[\texttt{b}] Only suitable in the argument specification of an
+ environment, it denotes the body of the environment, between
+ |\begin|\marg{environment} and |\end|\marg{environment}. See
+ Section~\ref{sec:cmd:body} for details.
+\end{itemize}
+The types which define optional arguments are:
+\begin{itemize}
+ \item[\texttt{o}] A standard \LaTeX{} optional argument, surrounded with square
+ brackets, which will supply the special |-NoValue-| marker if not given
+ (as described later).
+ \item[\texttt{d}] Given as \texttt{d}\meta{token1}\meta{token2}, an optional
+ argument which is delimited by \meta{token1} and \meta{token2}. As with
+ \texttt{o}, if no value is given the special marker |-NoValue-| is
+ returned.
+ \item[\texttt{O}] Given as \texttt{O}\marg{default}, is like \texttt{o}, but returns
+ \meta{default} if no value is given.
+ \item[\texttt{D}] Given as \texttt{D}\meta{token1}\meta{token2}\marg{default}, it is
+ as for \texttt{d}, but returns \meta{default} if no value is given.
+ Internally, the \texttt{o}, \texttt{d} and \texttt{O} types are
+ short-cuts to an appropriated-constructed \texttt{D} type argument.
+ \item[\texttt{s}] An optional star, which will result in a value
+ \cs{BooleanTrue} if a star is present and \cs{BooleanFalse}
+ otherwise (as described later).
+ \item[\texttt{t}] An optional \meta{token}, which will result in a value
+ \cs{BooleanTrue} if \meta{token} is present and \cs{BooleanFalse}
+ otherwise. Given as \texttt{t}\meta{token}.
+ \item[\texttt{e}] Given as \texttt{e}\marg{tokens}, a set of optional
+ \emph{embellishments}, each of which requires a \emph{value}.
+ If an embellishment is not present, |-NoValue-| is returned. Each
+ embellishment gives one argument, ordered as for the list of
+ \meta{tokens} in the argument specification. All \meta{tokens}
+ must be distinct.
+ \item[\texttt{E}] As for \texttt{e} but returns one or more \meta{defaults}
+ if values are not given: \texttt{E}\marg{tokens}\marg{defaults}. See
+ Section~\ref{sec:cmd:embellishment} for more details.
+\end{itemize}
+
+\subsection{Modifying argument descriptions}
+
+In addition to the argument \emph{types} discussed above, the argument
+description also gives special meaning to three other characters.
+
+First, \texttt{+} is used to make an argument long (to accept paragraph
+tokens). In contrast to \cs{newcommand}, this applies on an
+argument-by-argument basis. So modifying the example to `|s o o +m O{default}|'
+means that the mandatory argument is now \cs{long}, whereas the optional
+arguments are not.
+
+Secondly, \texttt{!} is used to control whether spaces are allowed before
+optional arguments. There are some subtleties to this, as \TeX{} itself
+has some restrictions on where spaces can be `detected': more detail
+is given in Section~\ref{sec:cmd:opt-space}.
+
+Finally, the character \texttt{>} is used to declare so-called
+`argument processors', which can be used to modify the contents of an
+argument before it is passed to the macro definition. The use of argument
+processors is a somewhat advanced topic, (or at least a less commonly used
+feature) and is covered in Section~\ref{sec:cmd:processors}.
+
+\subsection{Creating document commands and environments}
+
+\begin{decl}
+ |\NewDocumentCommand| \arg{cmd} \arg{arg spec} \arg{code} \\
+ |\RenewDocumentCommand| \arg{cmd} \arg{arg spec} \arg{code} \\
+ |\ProvideDocumentCommand| \arg{cmd} \arg{arg spec} \arg{code} \\
+ |\DeclareDocumentCommand| \arg{cmd} \arg{arg spec} \arg{code}
+\end{decl}
+This family of commands are used to create a \meta{cmd}. The argument
+specification for the function is given by \meta{arg spec}, and the command
+uses the \meta{code} with |#1|, |#2|, etc.\ replaced by the arguments found
+by the parser.
+
+An example:
+\begin{verbatim}
+ \NewDocumentCommand\chapter{s o m}
+ {%
+ \IfBooleanTF{#1}%
+ {\typesetstarchapter{#3}}%
+ {\typesetnormalchapter{#2}{#3}}%
+ }
+\end{verbatim}
+would be a way to define a \cs{chapter} command which would essentially behave
+like the current \LaTeXe{} command (except that it would accept an optional
+argument even when a \texttt{*} was parsed). The \cs{typesetnormalchapter}
+could test its first argument for being |-NoValue-| to see if an optional
+argument was present. (See Section~\ref{sec:cmd:special} for details of
+\cs{IfBooleanTF} and testing for |-NoValue-|.)
+
+The difference between the \cs{New...} \cs{Renew...}, \cs{Provide...}
+and \cs{Declare...} versions is the behavior if \meta{cmd} is already
+defined.
+\begin{itemize}
+ \item \cs{NewDocumentCommand} will issue an error if \meta{cmd}
+ has already been defined.
+ \item \cs{RenewDocumentCommand} will issue an error if \meta{cmd}
+ has not previously been defined.
+ \item \cs{ProvideDocumentCommand} creates a new definition for
+ \meta{function} only if one has not already been given.
+ \item \cs{DeclareDocumentCommand} will always create the new
+ definition, irrespective of any existing \meta{cmd} with the
+ same name. This should be used sparingly.
+\end{itemize}
+
+\begin{decl}
+ |\NewDocumentEnvironment| \arg{env} \arg{arg spec} \arg{beg-code} \arg{end-code} \\
+ |\RenewDocumentEnvironment| \arg{env} \arg{arg spec} \arg{beg-code} \arg{end-code} \\
+ |\ProvideDocumentEnvironment| \arg{env} \arg{arg spec} \arg{beg-code} \arg{end-code} \\
+ |\DeclareDocumentEnvironment| \arg{env} \arg{arg spec} \arg{beg-code} \arg{end-code}
+\end{decl}
+These commands work in the same way as \cs{NewDocumentCommand}, etc.\@, but
+create environments (\cs{begin}\arg{env} \ldots{}
+\cs{end}\arg{environment}). Both the \meta{beg-code} and \meta{end-code}
+may access the arguments as defined by \meta{arg spec}. The arguments will be
+given following \cs{begin}\arg{environment}.
+
+\subsection{Optional arguments}
+\label{sec:cmd:opt}
+
+In contrast to commands created using \LaTeXe{}'s \cs{newcommand}, optional
+arguments created using \cs{NewDocumentCommand} may safely be nested. Thus for
+example, following
+\begin{verbatim}
+\NewDocumentCommand\foo{om}{I grabbed `#1' and `#2'}
+\NewDocumentCommand\baz{o}{#1-#1}
+\end{verbatim}
+using the command as
+\begin{verbatim}
+\foo[\baz[stuff]]{more stuff}
+\end{verbatim}
+will print
+\begin{quote}
+I grabbed `stuff-stuff' and `more stuff'
+\end{quote}
+This is particularly useful when placing a command with an optional argument
+\emph{inside} the optional argument of a second command.
+
+When an optional argument is followed by a mandatory argument with the same
+delimiter, the parser issues a warning because the optional argument could not
+be omitted by the user, thus becoming in effect mandatory. This can apply to
+\texttt{o}, \texttt{d}, \texttt{O}, \texttt{D}, \texttt{s}, \texttt{t},
+\texttt{e}, and \texttt{E} type arguments followed by \texttt{r} or
+\texttt{R}-type required arguments.
+
+The default for \texttt{O}, \texttt{D} and \texttt{E} arguments can be
+the result of grabbing another argument. Thus for example
+\begin{verbatim}
+ \NewDocumentCommand\foo{O{#2} m}
+\end{verbatim}
+would use the mandatory argument as the default for the leading optional
+one.
+
+\subsection{Spacing and optional arguments}
+\label{sec:cmd:opt-space}
+
+\TeX{} will find the first argument after a function name irrespective of any
+intervening spaces. This is true for both mandatory and optional arguments. So
+|\foo[arg]| and \verb*|\foo [arg]| are equivalent. Spaces are also ignored when
+collecting arguments up to the last mandatory argument to be collected (as it
+must exist). So after
+\begin{verbatim}
+ \NewDocumentCommand\foo{m o m}{ ... }
+\end{verbatim}
+the user input |\foo{arg1}[arg2]{arg3}| and \verb*|\foo{arg1} [arg2] {arg3}|
+will both be parsed in the same way.
+
+The behavior of optional arguments \emph{after} any mandatory arguments is
+selectable. The standard settings will allow spaces here, and thus with
+\begin{verbatim}
+ \NewDocumentCommand\foobar{m o}{ ... }
+\end{verbatim}
+both |\foobar{arg1}[arg2]| and \verb*|\foobar{arg1} [arg2]| will find an
+optional argument. This can be changed by giving the modified |!| in the
+argument specification:
+\begin{verbatim}
+ \NewDocumentCommand\foobar{m !o}{ ... }
+\end{verbatim}
+where \verb*|\foobar{arg1} [arg2]| will not find an optional argument.
+
+There is one subtly here due to the difference in handling by \TeX{} of
+`control symbols', where the command name is made up of a single
+character, such as `\texttt{\textbackslash\textbackslash}'.
+Spaces are not ignored by \TeX{} here,
+and thus it is possible to require an optional argument directly follow such a
+command. The most common example is the use of \texttt{\textbackslash\textbackslash}
+in \pkg{amsmath} environments, which in the terms here would be defined as
+\begin{verbatim}
+ \NewDocumentCommand\\{!s !o}{ ... }
+\end{verbatim}
+
+\subsection{`Embellishments'}
+\label{sec:cmd:embellishment}
+
+The \texttt{E}-type argument allows one default value per test token. This is
+achieved by giving a list of defaults for each entry in the list, for example:
+\begin{verbatim}
+ E{^_}{{UP}{DOWN}}
+\end{verbatim}
+If the list of default values is \emph{shorter} than the list of test tokens,
+the special |-NoValue-| marker will be returned (as for the \texttt{e}-type
+argument). Thus for example
+\begin{verbatim}
+ E{^_}{{UP}}
+\end{verbatim}
+has default \texttt{UP} for the |^| test character, but will return the
+|-NoValue-| marker as a default for |_|. This allows mixing of explicit
+defaults with testing for missing values.
+
+
+\subsection{Testing special values}
+\label{sec:cmd:special}
+
+Optional arguments make use of dedicated variables to return information about
+the nature of the argument received.
+
+\begin{decl}
+ |\IfNoValueTF| \arg{arg} \arg{true code} \arg{false code} \\
+ |\IfNoValueT| \arg{arg} \arg{true code} \arg{false code} \\
+ |\IfNoValueF| \arg{arg} \arg{true code} \arg{false code}
+\end{decl}
+The \cs{IfNoValue(TF)} tests are used to check if \meta{argument} (|#1|,
+|#2|, \emph{etc.}) is the special |-NoValue-| marker For example
+\begin{verbatim}
+ \NewDocumentCommand\foo{o m}
+ {%
+ \IfNoValueTF {#1}%
+ {\DoSomethingJustWithMandatoryArgument{#2}}%
+ {\DoSomethingWithBothArguments{#1}{#2}}%
+ }
+\end{verbatim}
+will use a different internal function if the optional argument
+is given than if it is not present.
+
+Note that three tests are available, depending on which outcome
+branches are required: \cs{IfNoValueTF}, \cs{IfNoValueT} and
+\cs{IfNoValueF}.
+
+As the \cs{IfNoValue(TF)} tests are expandable, it is possible to
+test these values later, for example at the point of typesetting or
+in an expansion context.
+
+It is important to note that |-NoValue-| is constructed such that it
+will \emph{not} match the simple text input |-NoValue-|, i.e.~that
+\begin{verbatim}
+ \IfNoValueTF{-NoValue-}
+\end{verbatim}
+will be logically \texttt{false}.
+When two optional arguments follow each other (a syntax we typically
+discourage), it can make sense to allow users of the command to
+specify only the second argument by providing an empty first
+argument. Rather than testing separately for emptiness and for
+|-NoValue-| it is then best to use the argument type~|O| with an
+empty default value, and simply test for emptiness using the
+\pkg{expl3} conditional \cs{tl_if_blank:nTF} or its \pkg{etoolbox}
+analogue \cs{ifblank}.
+
+\begin{decl}
+ |\IfValueTF| \arg{arg} \arg{true code} \arg{false code} \\
+ |\IfValueT| \arg{arg} \arg{true code} \arg{false code} \\
+ |\IfValueF| \arg{arg} \arg{true code} \arg{false code}
+\end{decl}
+The reverse form of the \cs{IfNoValue(TF)} tests are also available
+as \cs{IfValue(TF)}. The context will determine which logical
+form makes the most sense for a given code scenario.
+
+\begin{decl}
+ |\BooleanFalse| \\
+ |\BooleanTrue|
+\end{decl}
+The \texttt{true} and \texttt{false} flags set when searching for
+an optional character (using \texttt{s} or \texttt{t\meta{char}}) have
+names which are accessible outside of code blocks.
+
+\begin{decl}
+ |\IfBooleanTF| \arg{arg} \arg{true code} \arg{false code} \\
+ |\IfBooleanT| \arg{arg} \arg{true code} \arg{false code} \\
+ |\IfBooleanF| \arg{arg} \arg{true code} \arg{false code}
+\end{decl}
+Used to test if \meta{argument} (|#1|, |#2|, \emph{etc.}) is
+\cs{BooleanTrue} or \cs{BooleanFalse}. For example
+\begin{verbatim}
+ \NewDocumentCommand\foo{sm}
+ {%
+ \IfBooleanTF {#1}%
+ {\DoSomethingWithStar{#2}}%
+ {\DoSomethingWithoutStar{#2}}%
+ }
+\end{verbatim}
+checks for a star as the first argument, then chooses the action to
+take based on this information.
+
+\subsection{Argument processors}
+\label{sec:cmd:processors}
+
+Argument processor are applied to an argument \emph{after} it has been grabbed
+by the underlying system but before it is passed to \meta{code}. An argument
+processor can therefore be used to regularize input at an early stage, allowing
+the internal functions to be completely independent of input form. Processors
+are applied to user input and to default values for optional arguments, but
+\emph{not} to the special |-NoValue-| marker.
+
+Each argument processor is specified by the syntax \texttt{>}\marg{processor}
+in the argument specification. Processors are applied from right to left, so
+that
+\begin{verbatim}
+ >{\ProcessorB} >{\ProcessorA} m
+\end{verbatim}
+would apply \cs{ProcessorA} followed by \cs{ProcessorB} to the tokens grabbed
+by the \texttt{m} argument.
+
+\begin{decl}
+ |\SplitArgument| \arg{number} \arg{token(s)}
+\end{decl}
+This processor splits the argument given at each occurrence of the
+\meta{tokens} up to a maximum of \meta{number} tokens (thus
+dividing the input into $\text{\meta{number}} + 1$ parts).
+An error is given if too many \meta{tokens} are present in the
+input. The processed input is placed inside
+$\text{\meta{number}} + 1$ sets of braces for further use.
+If there are fewer than \arg{number} of \arg{tokens} in the argument
+then |-NoValue-| markers are added at the end of the processed
+argument.
+\begin{verbatim}
+ \NewDocumentCommand \foo {>{\SplitArgument{2}{;}} m}
+ {\InternalFunctionOfThreeArguments#1}
+\end{verbatim}
+If only a single character \meta{token} is used for the split, any
+category code $13$ (active) character matching the \meta{token} will
+be replaced before the split takes place.
+Spaces are trimmed at each end of each item parsed.
+
+\begin{decl}
+ |\SplitList| \arg{token(s)}
+\end{decl}
+This processor splits the argument given at each occurrence of the
+\meta{token(s)} where the number of items is not fixed. Each item is
+then wrapped in braces within |#1|. The result is that the
+processed argument can be further processed using a mapping function
+(see below).
+\begin{verbatim}
+ \NewDocumentCommand \foo {>{\SplitList{;}} m}
+ {\MappingFunction#1}
+\end{verbatim}
+If only a single character \meta{token} is used for the split, any
+category code $13$ (active) character matching the \meta{token} will
+be replaced before the split takes place.
+Spaces are trimmed at each end of each item parsed.
+
+\begin{decl}
+ |\ProcessList| \arg{list} \arg{function}
+\end{decl}
+To support \cs{SplitList}, the function \cs{ProcessList} is available
+to apply a \meta{function} to every entry in a \meta{list}. The
+\meta{function} should absorb one argument: the list entry. For example
+\begin{verbatim}
+ \NewDocumentCommand \foo {>{\SplitList{;}} m}
+ {\ProcessList{#1}{\SomeDocumentCommand}}
+\end{verbatim}
+
+\begin{decl}
+ |\ReverseBoolean|
+\end{decl}
+This processor reverses the logic of \cs{BooleanTrue} and
+\cs{BooleanFalse}, so that the example from earlier would become
+\begin{verbatim}
+ \NewDocumentCommand\foo{>{\ReverseBoolean} s m}
+ {%
+ \IfBooleanTF#1%
+ {\DoSomethingWithoutStar{#2}}%
+ {\DoSomethingWithStar{#2}}%
+ }
+\end{verbatim}
+
+\begin{decl}
+ |\TrimSpaces|
+\end{decl}
+Removes any leading and trailing spaces (tokens with character code~$32$
+and category code~$10$) for the ends of the argument. Thus for example
+declaring a function
+\begin{verbatim}
+ \NewDocumentCommand\foo {>{\TrimSpaces} m}
+ {\showtokens{#1}}
+\end{verbatim}
+and using it in a document as
+\begin{flushleft}
+ \verb= =\verb*=\foo{ hello world }=
+\end{flushleft}
+will show `\verb*=hello world=' at the terminal, with the space at each
+end removed. \cs{TrimSpaces} will remove multiple spaces from the ends of
+the input in cases where these have been included such that the standard
+\TeX{} conversion of multiple spaces to a single space does not apply.
+
+\subsection{Body of an environment}
+\label{sec:cmd:body}
+
+While environments |\begin|\marg{environment}\ \dots{}\,|\end|\marg{environment}
+are typically used in cases where the code implementing the \meta{environment}
+does not need to access the contents of the environment (its `body'),
+it is sometimes useful to have the body as a standard argument.
+
+This is achieved by ending the argument specification with~\texttt{b}, which is
+a dedicated argument type for this situation. For instance
+\begin{verbatim}
+ \NewDocumentEnvironment{twice} {O{\ttfamily} +b}
+ {#2#1#2} {}
+\end{verbatim}
+\begin{verbatim}
+ \begin{twice}[\itshape]
+ Hello world!
+ \end{twice}
+\end{verbatim}
+typesets `Hello world!{\itshape Hello world!}'.
+
+The prefix |+| is used to allow multiple paragraphs in the environment's body.
+Argument processors can also be applied to \texttt{b}~arguments. By default,
+spaces are trimmed at both ends of the body: in the example there would
+otherwise be spaces coming from the ends the lines after |[\itshape]| and
+|world!|. Putting the prefix |!| before \texttt{b} suppresses space-trimming.
+
+When \texttt{b} is used in the argument specification, the last argument of the environment declaration (e.g., \cs{NewDocumentEnvironment}), which consists of an \meta{end code} to insert at
+|\end|\marg{environment}, is redundant since one can simply put that code at
+the end of the \meta{start code}. Nevertheless this (empty) \meta{end code}
+must be provided.
+
+Environments that use this feature can be nested.
+
+\subsection{Fully-expandable document commands}
+
+Document commands created using \cs{NewDocumentCommand}, etc.\@, are normally
+created so that they do not expand unexpectedly. This is done using engine
+features, so is more powerful than \LaTeXe{}'s \cs{protect} mechanism. There
+are \emph{very rare} occasion when it may be useful to create functions using a
+expansion-only grabber. This imposes a number of restrictions on the
+nature of the arguments accepted by a function, and the code it implements.
+This facility should only be used when \emph{absolutely necessary}.
+
+\begin{decl}
+ |\NewExpandableDocumentCommand| \arg{cmd} \arg{arg spec} \arg{code} \\
+ |\RenewExpandableDocumentCommand| \arg{cmd} \arg{arg spec} \arg{code} \\
+ |\ProvideExpandableDocumentCommand| \arg{cmd} \arg{arg spec} \arg{code} \\
+ |\DeclareExpandableDocumentCommand| \arg{cmd} \arg{arg spec} \arg{code}
+\end{decl}
+This family of commands is used to create a document-level \meta{function},
+which will grab its arguments in a fully-expandable manner. The
+argument specification for the function is given by \meta{arg spec},
+and the function will execute \meta{code}. In general, \meta{code} will
+also be fully expandable, although it is possible that this will
+not be the case (for example, a function for use in a table might
+expand so that \cs{omit} is the first non-expandable non-space token).
+
+Parsing arguments by pure expansion imposes a number of restrictions on
+both the type of arguments that can be read and the error checking
+available:
+\begin{itemize}
+ \item The last argument (if any are present) must be one of the
+ mandatory types \texttt{m}, \texttt{r} or \texttt{R}.
+ \item The `verbatim' argument type \texttt{v} is not available.
+ \item Argument processors (using \texttt{>}) are not available.
+ \item It is not possible to differentiate between, for example
+ |\foo[| and |\foo{[}|: in both cases the \texttt{[} will be
+ interpreted as the start of an optional argument. As a
+ result, checking for optional arguments is less robust than
+ in the standard version.
+\end{itemize}
+
+\subsection{Details about argument delimiters}
+
+In normal (non-expandable) commands, the delimited types look for the
+initial delimiter by peeking ahead (using \pkg{expl3}'s |\peek_...|
+functions) looking for the delimiter token. The token has to have the
+same meaning and `shape' of the token defined as delimiter.
+There are three possible cases of delimiters: character tokens, control
+sequence tokens, and active character tokens. For all practical purposes
+of this description, active character tokens will behave exactly as
+control sequence tokens.
+
+\subsubsection{Character tokens}
+
+A character token is characterized by its character code, and its meaning
+is the category code~(|\catcode|). When a command is defined, the meaning
+of the character token is fixed into the definition of the command and
+cannot change. A command will correctly see an argument delimiter if
+the open delimiter has the same character and category codes as at the
+time of the definition. For example in:
+\begin{verbatim}
+ \NewDocumentCommand { \foobar } { D<>{default} } {(#1)}
+\end{verbatim}
+\begin{verbatim}
+ \foobar <hello> \par
+ \char_set_catcode_letter:N <
+ \foobar <hello>
+\end{verbatim}
+the output would be:
+\begin{verbatim}
+ (hello)
+ (default)<hello>
+\end{verbatim}
+as the open-delimiter |<| changed in meaning between the two calls to
+|\foobar|, so the second one doesn't see the |<| as a valid delimiter.
+Commands assume that if a valid open-delimiter was found, a matching
+close-delimiter will also be there. If it is not (either by being
+omitted or by changing in meaning), a low-level \TeX{} error is raised
+and the command call is aborted.
+
+\subsubsection{Control sequence tokens}
+
+A control sequence (or control character) token is characterized by is
+its name, and its meaning is its definition.
+A token cannot have two different meanings at the same time.
+When a control sequence is defined as delimiter in a command,
+it will be detected as delimiter whenever the control sequence name
+is found in the document regardless of its current definition.
+For example in:
+\begin{verbatim}
+ \cs_set:Npn \x { abc }
+ \NewDocumentCommand { \foobar } { D\x\y{default} } {(#1)}
+ \foobar \x hello\y \par
+ \cs_set:Npn \x { def }
+ \foobar \x hello\y
+\end{verbatim}
+the output would be:
+\begin{verbatim}
+ (hello)
+ (hello)
+\end{verbatim}
+with both calls to the command seeing the delimiter |\x|.
+
+\subsection{Creating new argument processors}
+
+\begin{decl}
+ |\ProcessedArgument|
+\end{decl}
+Argument processors allow manipulation of a grabbed argument before it is
+passed to the underlying code. New processor implementations may be created
+as functions which take one trailing argument, and which leave their result in
+the \cs{ProcessedArgument} variable. For example, \cs{ReverseBoolean} is
+defined as
+\begin{verbatim}
+\ExplSyntaxOn
+ \cs_new_protected:Npn \ReverseBoolean #1
+ {
+ \bool_if:NTF #1
+ { \tl_set:Nn \ProcessedArgument { \c_false_bool } }
+ { \tl_set:Nn \ProcessedArgument { \c_true_bool } }
+ }
+\ExplSyntaxOff
+\end{verbatim}
+[As an aside: the code is written in \pkg{expl3}, so we don't have to
+ worry about spaces creeping into the definition.]
+
+\subsection{Access to the argument specification}
+
+The argument specifications for document commands and environments are
+available for examination and use.
+
+\begin{decl}
+ |\GetDocumentCommandArgSpec| \arg{function} \\
+ |\GetDocumentEnvironmentArgSpec| \arg{environment}
+\end{decl}
+These functions transfer the current argument specification for the
+requested \meta{function} or \meta{environment} into the token list
+variable \cs{ArgumentSpecification}. If the \meta{function} or
+\meta{environment} has no known argument specification then an error
+is issued. The assignment to \cs{ArgumentSpecification} is local to
+the current \TeX{} group.
+
+\begin{decl}
+ |\ShowDocumentCommandArgSpec| \arg{function} \\
+ |\ShowDocumentEnvironmentArgSpec| \arg{environment}
+\end{decl}
+These functions show the current argument specification for the
+requested \meta{function} or \meta{environment} at the terminal. If
+the \meta{function} or \meta{environment} has no known argument
+specification then an error is issued.
+
+\end{document}
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