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+\def\filedate{2003/12/03}
+\def\fileversion{2.21}
+%
+% \iffalse
+% File: nameref.dtx
+% Copyright (C) 1995-9 Sebastian Rahtz
+%               2000-3 Sebastian Rahtz, Heiko Oberdiek
+%
+%% This file is part of the `Hyperref Bundle'.
+%% -------------------------------------------
+%%
+%% It may be distributed under the conditions of the LaTeX Project Public
+%% License, either version 1.2 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 1.2 or later is part of all distributions of LaTeX
+%% version 1999/12/01 or later.
+%%
+%% The list of all files belonging to the `Hyperref Bundle' is
+%% given in the file `manifest.txt'.
+%<*driver>
+\documentclass{ltxdoc}
+\begin{document}
+  \title{%
+    Section name references in \LaTeX
+    \thanks{%
+      This file has version number \fileversion,
+      last revised \filedate.%
+    }%
+  }
+  \author{Sebastian Rahtz}
+  \date{\filedate}
+  \maketitle
+  \tableofcontents
+  \DocInput{nameref.dtx}
+\end{document}
+%</driver>
+% \fi
+% \CheckSum{463}
+% \StopEventually{}
+% \section{Introduction}
+% Cross-referencing to include the \emph{name} of the section, rather than
+% just the number or page. This works by redefining some of the inside
+% \LaTeX\ macros, so it is vulnerable to future changes.
+% \section{History}
+% Sebastian Rahtz, for Lou Burnard, March 15th 1994;
+% SPQR CERN July 1994;
+% Last mod. Sept. 3th MG;
+% Sept. 19th SPQR;
+% April 11th 1995 SPQR (added section formatting hook);
+% April 14th 1995 SPQR (compatibility with hyperref);
+% June 22 1995 SPQR (removed typeout from Sectionformat);
+% September 22 1997 added varioref hacks by Corey Minyard;
+% September 28th changes by David Carlisle.
+%    \begin{macrocode}
+%<*package>
+\ProvidesPackage{nameref}[\filedate\space v\fileversion
+  \space Cross-referencing by name of section]
+%    \end{macrocode}
+%
+% We redefine |\label| so that it also writes the name of the
+% current section to the .aux file; if the name ends in a dot,
+% we zap it. To allow for the hyperref package, also write
+% fourth and fifth fields (empty by default;
+% used for cross-ref name, and file).
+%    \begin{macrocode}
+\def\strip@period#1.\relax#2\@@@{#1}
+%    \end{macrocode}
+%
+%    Here is tested, whether package showkeys is loaded.
+%    But if option final is used, the macros of showkeys
+%    are not defined, so we have to check an additional
+%    test.
+%    \begin{macrocode}
+\newif\ifNR@showkeys
+\NR@showkeysfalse
+\@ifpackageloaded{showkeys}{%
+  \begingroup
+    \@ifundefined{SK@@label}{%
+    }{%
+      \global\NR@showkeystrue
+    }%
+  \endgroup
+}{}
+%    \end{macrocode}
+%    \begin{macrocode}
+\def\label#1{%
+  \@bsphack
+  \begingroup
+    \let\label\@gobble
+    \def\ref{\protect\ref}%
+    \edef\@currentlabstr{%
+      \expandafter\strip@prefix\meaning\@currentlabelname
+    }%
+    \protected@write\@auxout{}{%
+      \string\newlabel{#1}{%
+        {\@currentlabel}%
+        {\thepage}%
+        {\expandafter\strip@period\@currentlabstr\relax.\relax\@@@}%
+        {\@currentHref}{}%
+      }%
+    }%
+  \endgroup
+  \@esphack
+}%
+\ifNR@showkeys
+  \def\label#1{%
+    \@bsphack
+    \SK@\SK@@label{#1}%
+    \begingroup
+      \let\label\@gobble
+      \def\ref{\protect\ref}%
+      \edef\@currentlabstr{%
+        \expandafter\strip@prefix\meaning\@currentlabelname
+      }%
+      \protected@write\@auxout{}{%
+        \string\newlabel{#1}{%
+          {\@currentlabel}%
+          {\thepage}%
+          {\expandafter\strip@period\@currentlabstr\relax.\relax\@@@}%
+          {\@currentHref}{}%
+        }%
+      }%
+    \endgroup
+    \@esphack
+  }%
+\fi
+%    \end{macrocode}
+%    \begin{macrocode}
+\let\ltx@label\label
+%    \end{macrocode}
+% Needed for the \emph{subeqnarray} package.
+%    \begin{macrocode}
+\@ifundefined{slabel}{}{%
+  \def\slabel#1{%
+    \@bsphack
+    \if@filesw
+      {%
+        \let\label\@gobble
+        \def\ref{\protect\ref}%
+        \edef\@currentlabstr{%
+          \expandafter\strip@prefix\meaning\@currentlabelname
+        }%
+        \let\thepage\relax
+        \def\protect{\noexpand\noexpand\noexpand}%
+        \edef\@tempa{%
+          \write\@auxout{%
+            \string\newlabel{#1}{%
+              {\thesubequation}%
+              {\thepage}%
+              {\expandafter\strip@period
+                \@currentlabstr\relax.\relax\@@@}%
+              {\@currentHref}{}%
+            }%
+          }%
+        }%
+        \expandafter
+      }%
+      \@tempa
+      \if@nobreak\ifvmode\nobreak\fi\fi
+    \fi
+    \@esphack
+  }%
+}
+%    \end{macrocode}
+% Overload an AMS \LaTeX\ command, which uses |\newlabel|. Sigh!
+%    \begin{macrocode}
+\def\@writetocindents@{%
+  \begingroup
+  \@for\@tempa:=-1,0,1,2,3\do{%
+    \immediate\write\@auxout{%
+      \string\newlabel{tocindent\@tempa}{%
+        \csname r@tocindent\@tempa\endcsname{}{}{}{}%
+      }%
+    }%
+  }%
+  \endgroup}
+%    \end{macrocode}
+% Add to the underlying section heading macros so that they
+% note the section name for use by label.
+%
+% If a section heading or the like has a |\label| in it,
+% we need to extract it, or subsequent processing breaks.
+% This is done by the label-writing routine.
+%
+% First the numbered sections. While we are about it, put in
+% a useful section formatting macro.
+%    \begin{macrocode}
+\let\NR@sect\@sect
+\newcounter{section@level}
+\def\@sect#1#2#3#4#5#6[#7]#8{%
+  \setcounter{section@level}{#2}%
+  \def\@currentlabelname{#7}%
+  \NR@sect{#1}{#2}{#3}{#4}{#5}{#6}[{#7}]{\Sectionformat{#8}{#2}}%
+}
+%    \end{macrocode}
+% and now the unnumbered ones
+%    \begin{macrocode}
+\let\NR@ssect\@ssect
+\def\@ssect#1#2#3#4#5{%
+  \def\@currentlabelname{#5}%
+  \NR@ssect{#1}{#2}{#3}{#4}{\Sectionformat{#5}{#1}}%
+}
+%    \end{macrocode}
+%
+% Parts and chapters are treated differently. sigh.
+%
+%    \begin{macrocode}
+\let\NR@part\@part
+\def\@part[#1]#2{%
+  \def\@currentlabelname{#1}%
+  \NR@part[{#1}]{#2}%
+}
+\let\NR@chapter\@chapter
+\def\@chapter[#1]#2{%
+  \def\@currentlabelname{#1}%
+  \NR@chapter[{#1}]{#2}%
+}
+\let\NR@schapter\@schapter
+\def\@schapter#1{%
+  \def\@currentlabelname{#1}%
+  \NR@schapter{#1}%
+}
+%    \end{macrocode}
+%
+% Compatibility for package titlesec.
+%    \begin{macrocode}
+\AtBeginDocument{%
+  \@ifpackageloaded{titlesec}{%
+    \let\NRorg@ttl@sect@i\ttl@sect@i
+    \def\ttl@sect@i#1#2[#3]#4{%
+      \def\@currentlabelname{#4}%
+      \NRorg@ttl@sect@i{#1}{#2}[{#3}]{#4}%
+    }%
+  }{}%
+}
+%    \end{macrocode}
+%
+% We default the label and hypertext reference to be empty.
+%    \begin{macrocode}
+\def\@currentlabelname{}
+\def\@currentHref{}
+%    \end{macrocode}
+% Since the second part of the preserved reference now has five parts
+% (number, page, name, hypertext reference and file), we need extra utility
+% macros:
+%    \begin{macrocode}
+\long\def\@firstoffive#1#2#3#4#5{#1}
+\long\def\@secondoffive#1#2#3#4#5{#2}
+\long\def\@thirdoffive#1#2#3#4#5{#3}
+\long\def\@fourthoffive#1#2#3#4#5{#4}
+\long\def\@fifthoffive#1#2#3#4#5{#5}
+%    \end{macrocode}
+% We have to redefine |\ref| and |\pageref| to know about extra
+% reference elements. Make them robust, and compatible with Babel.
+% The Babel switch is mimicked if not already defined.
+% Some support for package |showkeys| is implemented. If
+% option |notref| of that package is set, |\SK@ref| has the
+% meaning of |\@empty|.
+%    \begin{macrocode}
+\providecommand*\@safe@activestrue{}%
+\providecommand*\@safe@activesfalse{}%
+\def\T@ref#1{%
+  \@safe@activestrue
+  \expandafter\@setref\csname r@#1\endcsname\@firstoffive{#1}%
+  \@safe@activesfalse
+}%
+\def\T@pageref#1{%
+  \@safe@activestrue
+  \expandafter\@setref\csname r@#1\endcsname\@secondoffive{#1}%
+  \@safe@activesfalse
+}%
+\ifNR@showkeys
+  \ifx\SK@ref\@empty
+  \else
+    \def\T@ref#1{%
+      \@safe@activestrue
+      \SK@\SK@@ref{#1}%
+      \expandafter\@setref\csname r@#1\endcsname\@firstoffive{#1}%
+      \@safe@activesfalse
+    }%
+    \def\T@pageref#1{%
+      \@safe@activestrue
+      \SK@\SK@@ref{#1}%
+      \expandafter\@setref\csname r@#1\endcsname\@secondoffive{#1}%
+      \@safe@activesfalse
+    }%
+  \fi
+\fi
+%    \end{macrocode}
+%    Package |hyperref| uses its own definitions of |\ref| and
+%    |\pageref| because it extends the syntax by the star form.
+%    |\DeclareRobustCommand| is used by hyperref.
+%    Package |nameref| can be loaded before, after hyperref or after
+%    hyperref's definitions in |\AtBeginDocument|.
+%    \begin{macrocode}
+\@ifpackageloaded{hyperref}{%
+}{%
+  \DeclareRobustCommand{\ref}{\T@ref}%
+  \DeclareRobustCommand{\pageref}{\T@pageref}%
+}
+%    \end{macrocode}
+% \section{Usage and frontend}
+% Access the (third) name part with |\nameref|;
+%    \begin{macrocode}
+\def\T@nameref#1{%
+  \@safe@activestrue
+  \expandafter\@setref\csname r@#1\endcsname\@thirdoffive{#1}%
+  \@safe@activesfalse
+}%
+\ifNR@showkeys
+  \ifx\SK@ref\@empty
+  \else
+    \def\T@nameref#1{%
+      \@safe@activestrue
+      \SK@\SK@@ref{#1}%
+      \expandafter\@setref\csname r@#1\endcsname\@thirdoffive{#1}%
+      \@safe@activesfalse
+    }%
+  \fi
+\fi
+\def\nameref{\protect\T@nameref}
+%    \end{macrocode}
+% An extended form which gives title and page number.
+%    \begin{macrocode}
+\def\Nameref#1{`\nameref{#1}' on page~\pageref{#1}}
+%    \end{macrocode}
+%
+% The default for |\Sectionformat|
+%    \begin{macrocode}
+\providecommand\Sectionformat[2]{#1}
+%    \end{macrocode}
+% \subsection{Compatibility with varioref}
+% [This section was derived by Corey Minyard \texttt{minyard@acm.org}
+% from the varioref package]
+%    \begin{macrocode}
+\ifx\csname @@vpageref\endcsname\relax
+\else
+  \def\@@vpageref#1[#2]#3{%
+    \leavevmode\unskip
+    \global\advance\c@vrcnt\@ne
+    \@ifundefined{r@\the\c@vrcnt @vr}%
+      {\@namedef{r@\the\c@vrcnt @vr}{{??}{??}{??}{??}{??}}}{}%
+    \edef\@tempa{%
+      \expandafter\expandafter\expandafter
+      \@secondoffive\csname r@\the\c@vrcnt @vr\endcsname
+    }%
+    \@ifundefined{r@\the\c@vrcnt @xvr}%
+      {\@namedef{r@\the\c@vrcnt @xvr}{{??}{??}{??}{??}{??}}}{}%
+    \edef\@tempb{%
+      \expandafter\expandafter\expandafter
+      \@secondoffive\csname r@\the\c@vrcnt @xvr\endcsname
+    }%
+    {%
+      \let\@currentlabel\@empty
+      \expandafter\label\expandafter{\the\c@vrcnt @xvr}%
+    }%
+    \ifx\@tempa\@tempb
+    \else
+      \vref@err{%
+        \noexpand\vref at page boundary
+        \@tempb-\@tempa\space (may loop)%
+      }%
+    \fi
+    \@ifundefined{r@#3}{\@namedef{r@#3}{{??}{??}{??}{??}{??}}}{}%
+    \edef\@tempb{%
+      \expandafter\expandafter\expandafter
+      \@secondoffive\csname r@#3\endcsname
+    }%
+    \space
+    \ifx\@tempa\@tempb
+      #1%
+    \else
+      #2%
+      \is@pos@number\@tempb{%
+        \is@pos@number\@tempa{%
+          \@tempcnta\@tempa
+          \advance\@tempcnta\@ne
+        }{%
+          \@tempcnta\maxdimen
+        }%
+        \ifnum \@tempb =\@tempcnta
+          \ifodd\@tempcnta
+            \if@twoside
+              \reftextfaceafter
+            \else
+              \reftextafter
+            \fi
+          \else
+            \reftextafter
+          \fi
+        \else
+          \advance\@tempcnta-2
+          \ifnum \@tempb =\@tempcnta
+            \ifodd\@tempcnta
+              \reftextbefore
+            \else
+              \if@twoside
+                \reftextfacebefore
+              \else
+                \reftextbefore
+              \fi
+            \fi
+          \else
+            \reftextfaraway{#3}%
+          \fi
+        \fi
+      }{%
+        \reftextfaraway{#3}%
+      }%
+    \fi
+    {%
+      \let\@currentlabel\@empty
+      \expandafter\label\expandafter{\the\c@vrcnt @vr}%
+    }%
+  }%
+  \DeclareRobustCommand\vnameref[1]{%
+    \unskip~\nameref{#1}%
+    \@vpageref[\unskip]{#1}%
+  }
+\fi
+%</package>
+%    \end{macrocode}
+%
+% \Finale
+\endinput