1 files changed, 23 insertions, 3 deletions
diff --git a/Master/texmf-dist/source/latex/issuulinks/issuulinks.dtx b/Master/texmf-dist/source/latex/issuulinks/issuulinks.dtx
index 8223de7cf2f..5204aba772e 100644
--- a/Master/texmf-dist/source/latex/issuulinks/issuulinks.dtx
+++ b/Master/texmf-dist/source/latex/issuulinks/issuulinks.dtx
@@ -1,5 +1,5 @@
 % \iffalse
-% $Id: issuulinks.dtx,v 1.5 2012-02-28 01:48:35 boris Exp $
+% $Id: issuulinks.dtx,v 1.6 2012-03-22 22:54:19 boris Exp $
 %
 % Copyright 2012, Boris Veytsman <borisv@lk.net>
 % This work may be distributed and/or modified under the
@@ -19,7 +19,7 @@
 % derived files issuulinks.sty, issuulinks.dtx. 
 %
 % \fi 
-% \CheckSum{83}
+% \CheckSum{106}
 %
 %
 %% \CharacterTable
@@ -130,7 +130,7 @@
 \ProvidesFile{issuulinks.dtx}
 %</gobble>
 %<style>\ProvidesPackage{issuulinks}
-[2012/02/27 v1.0 Links in ISSUU style]
+[2012/03/22 v1.1 Links in ISSUU style]
 %    \end{macrocode}
 %
 %    \begin{macrocode}
@@ -179,6 +179,7 @@
 %
 %
 % \begin{macro}{\newISSUUlink}
+% \changes{v1.1}{2012/03/22}{Added check for undefined/changed references} 
 % The page numbers in |\Hy@abspage| start from zero, so we need to
 % increment them:
 %    \begin{macrocode}
@@ -193,9 +194,28 @@
   \immediate\write\@mainaux{\string\providecommand\string\newISSUUlink[2]{}}%
   \fi}
 %    \end{macrocode}   
+% At the end of document \LaTeX{} checks whether references might
+% been changed or undefined.  Here we plug in into this mechanism:
+%    \begin{macrocode}
+\AtEndDocument{\let\newISSUUlink\@testISSUUlink}
+%    \end{macrocode}
 % \end{macro}
 % 
+% \begin{macro}{\@testISSUUlink}
+% \changes{v1.1}{2012/03/22}{Added macro} 
+%   Test whether this link is defined.  If not, set |\@tempswa| to
+%   true---this will cause \LaTeX{} to issue a warning:
+%    \begin{macrocode}
+\def\@testISSUUlink#1#2{\@tempcnta=#2\relax\advance\@tempcnta by1\relax
+  \edef\reserved@a{\the\@tempcnta}%
+  \expandafter\ifx\csname ISL@link#1\endcsname\reserved@a\else
+     \@tempswatrue
+  \fi}
+%    \end{macrocode}
+%   
+% \end{macro}
 %
+% 
 %
 %\subsection{Writing the Internal Link Information}
 %\label{sec:writing}