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+greek-fontenc
+#############
+Greek font encoding definition files
+************************************
+
+:Author: Günter Milde
+:Date: 2019-07-10
+:Copyright: © 2013 Günter Milde <milde@users.sf.net>
+:Licence: This work may be distributed and/or modified under the
+ conditions of the `LaTeX Project Public License`_, either
+ version 1.3 of this license or any later version.
+
+:Abstract: `LaTeX internal character representation` (LICR) macros are a
+ verbose but failsafe 7-bit ASCII encoding that works unaltered
+ under both, 8-bit TeX and XeTeX/LuaTeX. Use cases are macro
+ definitions and generated text
+
+ This package provides `Greek LICR macros`_ and encoding
+ definition files for `Greek text font encodings`_ for use with
+ fontenc_ (8-bit TeX) or fontspec_ (XeTeX/LuaTeX).
+
+ Included are also the LaTeX packages textalpha_ and alphabeta_.
+
+.. note:: The LICR macro names for Greek symbols are chosen pending
+ endorsement by the TeX community and related packages.
+
+ Names for archaic characters, accents/diacritics, and
+ punctuation may change in future versions.
+
+Changelog
+=========
+
+.. class:: borderless
+
+====== =========== ==========================================================
+0.9 2013-07-03 greek-fontenc.def_ "outsourced" from lgrxenc.def
+.. experimental files xunicode-greek.sty and
+ greek-euenc.def_: LICRs for XeTeX/LuaTeX.
+0.9.1 2013-07-18 Bugfix: wrong breathings psilioxia -> dasiaoxia.
+0.9.2 2013-07-19 Bugfix: Disable composite defs starting with char macro,
+.. fix "hiatus" handling.
+0.9.3 2013-07-24 Fix "input" path in xunicode-greek and greek-euenc.def.
+0.9.4 2013-09-10 greek-fontenc.sty: Greek text font encoding setup package,
+.. remove xunicode-greek.sty.
+0.10 2013-09-13 textalpha.sty_ and alphabeta.sty_ moved here from lgrx and
+ updated to work with XeTeX/LuaTeX.
+.. greek-fontenc.sty removed (obsoleted by textalpha.sty).
+0.10.1 2013-10-01 Bugfix in greek-euenc.def_ and alphabeta-euenc.def_.
+0.11 2013-11-28 Compatibility with Xe/LuaTeX in 8-bit mode,
+.. ``\greekscript`` TextCommand.
+0.11.1 2013-12-01 Fix identification of ``greek-euenc.def``.
+0.11.2 2014-09-04 Documentation update, remove duplicate code.
+0.12 2014-12-25 Fix auxiliary macro names in `textalpha`.
+.. Conservative naming: move definition of ``\<`` and ``\>``
+ from ``greek-fontenc.def`` to ``textalpha.sty``
+ (Bugreport David Kastrup).
+ Documentation update.
+0.13 2015-09-04 Support for `symbol variants`_,
+.. ``keep-semicolon`` option in textalpha_,
+.. ``\lccode``/``\uccode`` corrections for Unicode
+ (from Apostolos Syropoulos’ xgreek_) in greek-euenc_,
+.. Do not convert ``\ypogegrammeni`` to ``\prosgegrammeni``
+ with ``\MakeUppercase``.
+0.13.1 2015-12-07 Fix `rho with dasia bug`__ in lgrenc.def (Linus Romer).
+0.13.2 2016-02-05 Support for standard Unicode text font encoding "TU"
+ (new in fontspec v2.5a).
+0.13.3 2019-07-10 Drop error font declaration (cf. `ltxbugs 4399`_).
+0.13.4 2019-07-11 ``@uclclist`` entry for ``\prosgegrammeni``.
+.. Documentation update.
+====== =========== ==========================================================
+
+__ http://tex.stackexchange.com/questions/281631/greek-small-rho-with-dasia-and-also-psili-problem-with-accent-and-lgr-encodin
+.. _ltxbugs 4399:
+ https://www.latex-project.org/cgi-bin/ltxbugs2html?pr=latex%2F4399&search=
+
+
+TeX files
+=========
+
+`<greek-fontenc.def>`_
+ `Common Greek font encoding definitions <greek-fontenc.def.html>`_.
+
+.. _LGR font encoding definition file:
+
+`<lgrenc.def>`_
+ `LGR Greek font encoding definitions <lgrenc.def.html>`_.
+
+ This file is the successor of the basic LGR encoding definition file which
+ comes with babel_'s Greek support and of ``lgrxenc.def`` from the now
+ obsolete lgrx_ bundle.
+
+ .. _textalpha:
+
+`<textalpha.sty>`_
+ `Greek symbols in text <textalpha.sty.html>`_
+ independent of font encoding and TeX engine.
+
+ .. _alphabeta:
+
+`<alphabeta.sty>`_
+ Generic macros for `Greek symbols in text and math <alphabeta.sty.html>`_.
+
+`<alphabeta-euenc.def>`_
+ `Composite definitions with XeTeX/LuaTeX. <alphabeta-euenc.def.html>`_.
+
+ .. _greek-euenc:
+
+`<greek-euenc.def>`_
+ `Font setup for Greek with XeTeX/LuaTeX <greek-euenc.def.html>`_.
+ Requires euenc_.
+
+Literate source files were converted with PyLit_ to reStructuredText_ and
+with Docutils_ to the HTML documentation.
+
+
+Documentation and test documents
+================================
+
+`<textalpha-doc.tex>`__, `<textalpha-doc.pdf>`_
+ `The textalpha package`.
+
+`<alphabeta-doc.tex>`__ `<alphabeta-doc.pdf>`_
+ `The alphabeta package`.
+
+`<lgrenc-test.tex>`_, `<lgrenc-test.pdf>`_
+ Test and usage example.
+
+`<greek-euenc-doc.tex>`_, `<greek-euenc-doc.pdf>`_
+ Example for use of the Greek LICR definitions with XeTeX or
+ LuaTeX.
+
+`<greekhyperref.tex>`_, `<greekhyperref.pdf>`_
+ `Greek script in PDF metadata`.
+
+ The package hyperref_ defines the PU font encoding which also supports
+ (monotonic) Greek.
+
+Experimental files
+==================
+
+These files are still in development and will eventually be moved to/merged
+with other packages or removed in future versions:
+
+`<lgr2licr.lua>`_
+ `LGR Transcription to Greek LICR transformation <lgr2licr.lua.html>`_
+
+
+
+Installation
+============
+
+If possible, get this package from your distribution using its installation
+manager.
+
+Otherwise, make sure LaTeX can find the package and definition files:
+
+* Download and unpack greek-fontenc.zip_.
+
+* Copy/Move/Link files ending in ``.def`` or ``.sty`` to a suitable place in
+ the “TeX Directory Structure” (TDS_) and run ``texhash``, or place them in
+ the current working directory (e.g. for testing).
+
+Conflicts
+=========
+
+The arabi_ package provides the Babel ``arabic`` option which loads
+``arabicfnt.sty`` for font setup. This package overwrites the LICR macros
+``\omega`` and ``\textomega`` with font selecting commands. See the report
+for Debian `bug 858987`_ for details and the `arabi workaround`_ below.
+
+.. _bug 858987: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=858987
+
+Usage
+=====
+
+There are many alternatives to set up the support for a Greek font encoding
+provided by this package, e.g.:
+
+textalpha_:
+ Ensure support for Greek characters in text mode::
+
+ \usepackage{textalpha}
+
+ eventually with the normalize-symbols_ option to handle `symbol
+ variants`_ ::
+
+ \usepackage[normalize-symbols]{textalpha}
+
+ and/or the keep-semicolon_ option to use the `semicolon as erotimatiko`_
+ also in LGR ::
+
+ \usepackage[normalize-symbols,keep-semicolon]{textalpha}
+
+ This sets up LICR macros for Greek text charactes under both, 8-bit TeX
+ and Xe-/LuaTeX.
+ For details see `<textalpha-doc.tex>`_ and `<textalpha-doc.pdf>`_ (8-bit
+ TeX) as well as `<greek-euenc-doc.tex>`_ and `<greek-euenc-doc.pdf>`_
+ (XeTeX/LuaTeX).
+
+ .. _normalize-symbols: textalpha.sty.html#normalize-symbols
+ .. _keep-semicolon: textalpha.sty.html#keep-semicolon
+ .. _semicolon as erotimatiko: textalpha.sty.html#semicolon-as-erotimatiko
+
+alphabeta_:
+ To use the short macro names (``\alpha`` ... ``\Omega``) known from math
+ mode in both, text and math mode, write ::
+
+ \usepackage{alphabeta}
+
+ For details see `<alphabeta-doc.tex>`_ and `<alphabeta-doc.pdf>`_.
+
+Babel:
+ Use the ``greek`` option with Babel_::
+
+ \usepackage[greek]{babel}
+
+ This automatically loads ``lgrenc.def`` with 8-bit TeX and
+ ``greek-euenc.def`` with XeTeX/LuaTeX and provides localized auto-strings,
+ hyphenation and other localizations (see babel-greek_).
+
+ Babel can be used together with textalpha_ or alphabeta_.
+
+fontenc:
+ Declare LGR via fontenc_. For example, specify T1 (8-bit
+ Latin) as default font encoding and LGR for Greek with ::
+
+ \usepackage[LGR,T1]{fontenc}
+
+ Note that without textalpha_ or alphabeta_, Greek text macros work
+ only if the current font encoding supports Greek. See [fntguide]_ for
+ details and `<lgrenc-test.tex>`_ for an example.
+
+ It is possible to use 8-bit Greek text fonts in the LGR TeX font encoding
+ also with XeTeX/LuaTeX, if the fontenc_ package is loaded before
+ fontspec_ and textalpha_ or alphabeta_, e.g. ::
+
+ \usepackage[LGR]{fontenc}
+ \usepackage{fontspec}
+ \setmainfont{Linux Libertine O} % Latin Modern does not support Greek
+ \setsansfont{Linux Biolinum O}
+ \usepackage{textalpha}
+
+ See `<greek-euenc-doc.tex>`_, `<greek-euenc-doc.pdf>`_ and
+ `<lgrenc-test.tex>`_, `<lgrenc-test.pdf>`_.
+
+.. _arabi workaround:
+
+To work around the conflict with arabi_, it may suffice to ensure ``greek``
+is loaded after ``arabic``::
+
+ \usepackage[arabic,greek,english]{babel}
+
+More secure is an explicit reverse-definition, e.g. ::
+
+ % save original \omega
+ \let\mathomega\omega
+
+ \usepackage[utf8]{inputenc}
+ \usepackage[LAE,LGR,T1]{fontenc}
+ \usepackage[arabic,greek,english]{babel}
+
+ % fix arabtex:
+ \DeclareTextSymbol{\textomega}{LGR}{119}
+ \renewcommand{\omega}{\mathomega}
+
+
+Greek text font encodings
+=========================
+
+Greek TeX font encodings are the envisaged T7_, LGR_, and LGI_.
+Greek letters and symbols are also defined in the Unicode-based font
+encodings TU_, `EU1, EU2`_, and PU (hyperref_).
+
+T7
+--
+
+The [encguide]_ reserves the name T7 for a Greek `standard font encoding`.
+However, up to now, there is no agreement on an implementation because the
+restrictions for general text encodings are too severe for typesetting
+polytonic Greek.
+
+
+LGR
+---
+
+The LGR font encoding is the de-facto standard for typesetting Greek with
+(8-bit) LaTeX. `greek-fontenc` provides a comprehensive `LGR font
+encoding definition file`_.
+
+Fonts in this encoding include the `CB fonts`_ (matching CM), grtimes_
+(Greek Times), Kerkis_ (matching URW Bookman), DejaVu_, `Libertine GC`_, and
+the `GFS fonts`_. Setup of these fonts as Greek variant to
+matching Latin fonts is facilitated by the substitutefont_ package.
+
+
+The LGR font encoding allows to access Greek characters via an ASCII
+transliteration. This enables simple input with a Latin keyboard.
+Characters with diacritics can be selected by ligature definitions in the
+font (see [greek-usage]_, [teubner-doc]_, [cbfonts]_).
+
+A major drawback of the transliteration is, that you cannot access Latin
+letters if LGR is the active font encoding (e.g. in documents or parts of
+documents given the `Babel` language ``greek`` or ``polutionikogreek``).
+This means that for every Latin-written word or acronym an explicit
+language-switch is required. This problem can only be solved via a
+font-encoding comprising Latin and Greek like the envisaged T7_ or
+Unicode (with XeTeX or LuaTeX).
+
+LGI
+---
+
+The ‘Ibycus’ fonts from the package ibygrk_ implement an alternative
+transliteration scheme (also explained in [babel-patch]_).
+It is currently not supported by `greek-fontenc`.
+
+The font encoding file ``lgienc.def`` from ibycus-babel_ provides a basic
+setup (without any LICR macros or composite definitions).
+
+TU
+--
+
+Standard Unicode font encoding for XeTeX and LuaTeX loaded by fontspec_
+(since v2.5a). `greek-fontenc` adds support for the Greek script (see
+greek-euenc_).
+
+Xe/LuaTeX works with any system-wide installed `OpenType font`_. Suitable
+fonts supporting Greek include `CM Unicode`_, `Deja Vu`_, `EB Garamond`_,
+the `GFS fonts`_, `Libertine OTF`_, `Libertinus`_, `Old Standard`_,
+Tempora_, and `UM Typewriter`_ (all available on CTAN) but also many commercial
+fonts. Unfortunately, the fontspec_ default, `Latin Modern`_ misses most
+Greek characters.
+
+EU1, EU2
+--------
+
+Legacy Unicode font encodings for XeTeX and LuaTeX respectively.
+
+
+Greek LICR macros
+=================
+
+This package provides LaTeX internal character representations (LICR macros)
+for Greek letters and diacritics. Macro names were selected based on the
+following considerations:
+
+letters and symbols
+-------------------
+
+* The fntguide_ (section 6.4 Naming conventions) recommends:
+
+ Where possible, text symbols should be named as ``\text`` followed
+ by the **Adobe glyph name**: for example ``\textonequarter`` or
+ ``\textsterling``. Similarly, math symbols should be named as
+ ``\math`` followed by the glyph name, for example
+ ``\mathonequarter`` or ``\mathsterling``.
+
+ Problem:
+ The `Adobe Glyph List For New Fonts`_ has names for many glyphs in the
+ `Greek and Coptic` Unicode block, but not for `Greek extended`. The
+ `Adobe Glyph List`_ (for existing fonts) lists additional glyph names
+ used in older fonts. However, these are not intended for active use.
+
+* If there exists a **math-mode macro** for a symbol, the corresponding text
+ macro could be formed by prepending ``text``.
+
+ Example:
+ The glyph name for the GREEK SMALL LETTER FINAL SIGMA is ``sigma1``,
+ the corresponding math-macro is ``\varsigma``. The text symbol is
+ made available as ``\textvarsigma``.
+
+ Problem:
+ The math macros for the `symbol variants`_ ``\varepsilon`` and
+ ``\varphi`` map to characters named "GREEK SMALL *LETTER* ...", while
+ ``\vartheta``, ``\varkappa``, ``\varrho``, and ``\varpi`` map to "GREEK
+ ... *SYMBOL*" Unicode characters. (See also section 5.5.3 of the
+ unicode-math_ documentation.)
+
+* The `Unicode names list`_ provides standardized descriptive names for all
+ Unicode characters that use only capital letters of the Latin alphabet.
+ While not suited for direct use in LICR macros, they can be either
+
+ i. used as inspiration for new LICR macro names or
+ ii. converted to LICR macro names via a defined set of transformation rules.
+
+ Example:
+ ``\textfinalsigma`` is a descriptive alias for
+ GREEK SMALL LETTER FINAL SIGMA derived via the rules:
+
+ * drop "LETTER" if the name remains unique,
+ * drop "GREEK" if the name remains unique,
+ * use capitalized name for capital letters, lowercase for "SMALL" letters
+ and drop "SMALL",
+ * concatenate
+
+* Omit the "text" prefix for macros that do not have a math counterpart?
+
+ Pro:
+ + Simpler,
+ + ease of use (less typing, better readability of source text),
+ + many established text macro names without "text",
+ + ``text`` prefix does **not** mark a macro as encoding-specific or
+ "inserting a glyph". There are e.g. font-changing macros (``\textbf``,
+ ``\textit``) and encoding-changing macros (``\textgreek``,
+ ``\textcyr``).
+ + There are examples of encoding-specific macros
+ without the ``text``-prefix, especially for letters, see encguide_.
+
+ Contra:
+ - Less consistent,
+ - possible name clashes
+ - ``text`` prefix marks a macro as confined to text (as opposed to math)
+ mode,
+
+ The font encoding definition files use the ``text`` prefix for symbols.
+ Aliases (short forms, compatibility defs, etc.) are defined in
+ additional packages (e.g. alphabeta.sty_, `babel-greek`_, or teubner_)
+
+
+accent macros
+-------------
+
+* standard accent macros (``\DeclareTextAccent`` definitions in
+ ``latex/base/...``) are one-symbol macros (``\' \" ... \u \v ...``) .
+
+* ``tipa.sty``, xunicode_, and ucs_ use the "text" prefix also for accents.
+
+ However, the `Adobe Glyph List For New Fonts`_ maps, e.g., "tonos" and
+ "dieresistonos" to the spacing characters GREEK TONOS and GREEK DIALYTIKA
+ TONOS, hence `\texttonos` and `\textdiaresistonos` should be spacing
+ characters.
+
+* textcomp (ts1enc.def) defines ``\capital...`` accents (i.e. without
+ ``text`` prefix).
+
+Currently, `greek-fontenc` uses for diacritics:
+
+- Greek names like in Unicode, and ``ucsencs.def``, and
+
+- the prefix ``\acc`` to distinguish the macros as `TextAaccent` and reduce
+ the risc of name clashes (cf. ``\@tabacckludge``).
+
+For the end-user "symbol macros" (``\~ \' \` \" \< \> \"' ...``) are
+provided. (The non-standard macros ``\<`` and ``\>`` only with
+textalpha_ or alphabeta_.)
+
+
+symbol variants
+---------------
+
+See also http://en.wikipedia.org/wiki/Greek_alphabet#Glyph_variants
+
+Mathematical notation distinguishes variant shapes for beta (β|ϐ), theta
+(θ|ϑ), phi (φ|ϕ), pi (π|ϖ), kappa (κ|ϰ), rho (ρ|ϱ), Theta (Θ|ϴ), and epsilon
+(ε|ϵ). The variations have no syntactic meaning in Greek text and Greek
+text fonts use the shape variants indiscriminately.
+
+Unicode defines separate code points for the symbol variants for use in
+mathematical context. However, they are sometimes also used in place of the
+corresponding letter characters in Unicode-encoded text.
+
+The variant shapes are not given separate code-points in the LGR_ font
+encoding.
+
+In mathematical mode, TeX supports the distinction between θ|ϑ, π|ϖ, φ|ϕ,
+ρ|ϱ, and ε|ϵ with ``\var<lettername>`` macros. However, the mapping of
+letter/symbol in Unicode to "normal"/variant in TeX is inconsistent
+and variant macros for ϴ ϐ, and ϰ are not available without additional
+packages (e.g. amssymb_ provides ϰ as ``\varkappa``).
+
+`greek-fontenc` provides ``\text<lettername>symbol`` LICR macros for these
+characters:
+
+* With Unicode fonts, the macros select the GREEK
+ <lettername> SYMBOL``.
+
+* With LGR encoded fonts, they report an error by default and are mapped to
+ the corresponding letter with the ``normalize-symbols`` option of
+ textalpha_ and alphabeta_ (loosing the distinction between the shape
+ variants).
+
+
+References
+----------
+
+An alternative, more complete set of short mnemonic character names is
+the `XML Entity Definitions for Characters`_ W3C Recommendation from
+01 April 2010.
+
+For glyph names of the LGR encoding see, e.g., ``CB.enc`` by Apostolos
+Syropoulos and ``xl-lgr.enc`` from the libertine_ (legacy) package.
+``lgr.cmap`` provides a mapping to Unicode characters.
+
+A full set of ``\text*`` symbol macros is defined in ``ucsencs.def``
+from the ucs_ package.
+
+Aliases from ``puenc.def`` ensure that the hyperref_ package can convert
+Greek text in "LICR encoding" to a PDF-string (utf-8 encoded input is used
+as-is).
+
+
+.. [fntguide] LaTeX3 Project Team, `LaTeX2ε font selection`, 2005.
+ http://mirror.ctan.org/macros/latex/doc/fntguide.pdf
+.. [encguide] Frank Mittelbach, Robin Fairbairns, Werner Lemberg,
+ LaTeX3 Project Team, `LaTeX font encodings`, 2006.
+ http://mirror.ctan.org/macros/latex/doc/encguide.pdf
+.. [greek-usage] Apostolos Syropoulos, `Writing Greek with the greek option
+ of the babel package`, 1997.
+ http://mirrors.ctan.org/language/babel/contrib/greek/usage.pdf
+.. [cbfonts] Claudio Beccari, `The CB Greek fonts`, Εὔτυπον, τεῦχος № 21, 2008.
+ http://www.eutypon.gr/eutypon/pdf/e2008-21/e21-a01.pdf
+.. [teubner-doc] Claudio Beccari, ``teubner.sty``
+ `An extension to the greek option of the babel package`, 2011.
+ http://mirror.ctan.org/macros/latex/contrib/teubner/teubner-doc.pdf
+
+.. [babel-patch] Werner Lemberg, `Unicode support for the Greek LGR
+ encoding` Εὔτυπον, τεῦχος № 20, 2008.
+ http://www.eutypon.gr/eutypon/pdf/e2008-20/e20-a03.pdf
+
+.. _LaTeX Project Public License: http://www.latex-project.org/lppl.txt
+.. _PyLit: http://pypi.python.org/pypi/pylit
+.. _reStructuredText: http://docutils.sourceforge.net/rst.html
+.. _Docutils: http://docutils.sourceforge.net/rst.html
+.. _TDS: http://www.tex.ac.uk/cgi-bin/texfaq2html?label=tds
+
+.. _Adobe Glyph List For New Fonts:
+ http://raw.githubusercontent.com/adobe-type-tools/agl-aglfn/master/aglfn.txt
+.. _Adobe Glyph List:
+ http://raw.githubusercontent.com/adobe-type-tools/agl-aglfn/master/glyphlist.txt
+.. _Unicode names list: http://www.unicode.org/Public/UNIDATA/NamesList.txt
+.. _XML Entity Definitions for Characters:
+ http://www.w3.org/TR/xml-entity-names/
+.. _CB fonts: http://www.ctan.org/pkg/cbgreek-complete
+.. _CM Unicode: https://www.ctan.org/pkg/cm-unicode
+.. _Deja Vu: http://dejavu-fonts.org
+.. _EB Garamond: https://ctan.org/pkg/ebgaramond
+.. _GFS fonts: http://www.ctan.org/pkg/gfs
+.. _Kerkis: http://www.ctan.org/pkg/kerkis
+.. _Latin Modern: http://www.gust.org.pl/projects/e-foundry/latin-modern
+.. _Libertine OTF: http://www.ctan.org/pkg/libertineotf
+.. _Libertine GC: https://www.ctan.org/pkg/libertinegc
+.. _Libertinus: https://ctan.org/pkg/libertinus
+.. _Old Standard: https://ctan.org/pkg/oldstandard
+.. _OpenType Font: https://ctan.org/topic/font-otf
+.. _UM Typewriter: https://www.ctan.org/pkg/umtypewriter
+.. _amssymb: http://www.ctan.org/pkg/amsfonts
+.. _arabi: https://www.ctan.org/pkg/arabi
+.. _babel-greek: http://www.ctan.org/pkg/babel-greek
+.. _babel: http://www.ctan.org/pkg/babel
+.. _dejavu: https://www.ctan.org/pkg/dejavu
+.. _euenc: http://www.ctan.org/pkg/euenc
+.. _fontenc: http://www.ctan.org/pkg/fontenc
+.. _fontspec: http://www.ctan.org/pkg/fontspec
+.. _greek-fontenc.zip: http://mirrors.ctan.org/language/greek/greek-fontenc.zip
+.. _grtimes: http://www.ctan.org/pkg/grtimes
+.. _hyperref: http://www.ctan.org/pkg/hyperref
+.. _ibycus-babel: http://www.ctan.org/pkg/ibycus-babel
+.. _ibygrk: http://www.ctan.org/pkg/ibygrk
+.. _lgrx: http://www.ctan.org/pkg/lgrx
+.. _libertine: http://www.ctan.org/pkg/libertine-legacy
+.. _substitutefont: http://www.ctan.org/pkg/substitutefont
+.. _tempora: https://www.ctan.org/pkg/tempora
+.. _teubner: http://www.ctan.org/pkg/teubner
+.. _ucs: http://www.ctan.org/pkg/unicode
+.. _unicode-math: http://www.ctan.org/pkg/unicode-math
+.. _xgreek: http://www.ctan.org/pkg/xgreek
+.. _xunicode: http://www.ctan.org/pkg/xunicode