[l2h] recycling images (?) problem

[gabriele balducci]

Hello all,

apologies if my question has an obvious answer.

I have a problem concerning what looks like a wrong image recycling.

Consider the following source, containing two xy environments:

----------------------------------------------
\documentclass[a4paper]{article}

\usepackage{xy}
\usepackage{html}

\begin{document}

\begin{displaymath}
\begin{xy}
<1em,0em>:  
*+{O};
p+/u0.1em/**\dir{}?<*\dir{|},
p+/d0.1em/**\dir{}?<*\dir{|},
p+/r2em/*+{P},**\dir{-};p="P";
"P";
p+/l1em/;p+/u0.7em/;p+/d1.4em/**\dir{.};
\end{xy}
\end{displaymath}

\begin{displaymath}
\begin{xy}
<1em,0em>:  
*+{O};
p+/u0.1em/**\dir{}?<*\dir{|},
p+/d0.1em/**\dir{}?<*\dir{|},
p+/r2em/*+{P},**\dir{=};p="P"; %<<<This is the only difference
"P";
p+/l1em/;p+/u0.7em/;p+/d1.4em/**\dir{.};
\end{xy}
\end{displaymath}

\end{document}
----------------------------------------------

The two environments are almost identical, but for the `double bond'
directional in the second one (marked on the snippet).


I translate with:

----------------------------------------------
latex2html  -split 0  \
            -link 0    \
            -address ""  \
            -info "" \
            -debug  \
            -dir /home/balducci/tmp/l2h-d   \
            -tmp /home/balducci/tmp/l2h-d     \
            source >> l2h-log 2>&1
----------------------------------------------


What I get is the first picture repeated twice.

The images.tex file contains only the first picture: the second one
does not get written to it. The generated html document sources the
same gif twice.

To me, it all works like l2h considers the two environments identical
and simply doubles the first one to avoid waste of resources (but the
two environments are NOT identical, and the double bond needs to be
there).

If I make some more "evident" change to the second environment, e.g.:

----------------------------------------------
\documentclass[a4paper]{article}

\usepackage{xy}
\usepackage{html}

\begin{document}

\begin{displaymath}
\begin{xy}
<1em,0em>:  
*+{O};
p+/u0.1em/**\dir{}?<*\dir{|},
p+/d0.1em/**\dir{}?<*\dir{|},
p+/r2em/*+{P},**\dir{-};p="P";
"P";
p+/l1em/;p+/u0.7em/;p+/d1.4em/**\dir{.};
\end{xy}
\end{displaymath}

\begin{displaymath}
\begin{xy}
<1em,0em>:  
*+{O};
p+/u0.1em/**\dir{}?<*\dir{|},
p+/d0.1em/**\dir{}?<*\dir{|},
p+/r2em/*+{P},**\dir{=};p="P"; %<<<This is the only difference
"P";
p+/l1em/;p+/u0.7em/;p+/d1.4em/**\dir{.};
"P"; %<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< ADDED THIS ONE
\end{xy}
\end{displaymath}

\end{document}
----------------------------------------------

then all works properly.

Why does not  l2h  recognize that the two environments are different?

Am I missing something?


Thank you very much in advance for any help.


Ciao
Gabriele

===========================================================================
Gabriele Balducci                  tel    I-040-5583957
Dipartimento di Scienze Chimiche   fax    I-040-5583903
Via L. Giorgieri 1                 e-mail balducci at univ.trieste.it
I-34127 TRIESTE
===========================================================================

PS: here are my main specs:
---------
dschbaldx:12> latex2html -version
Note: Loading /home/balducci/.latex2html-init
Note: Initialising with file: /home/balducci/.latex2html-init
This is LaTeX2HTML Version 2002-2-1 (1.70)
by Nikos Drakos, Computer Based Learning Unit, University of Leeds.
---------
dschbaldx:13> perl -version

This is perl, v5.8.0 built for i686-linux

Copyright 1987-2002, Larry Wall
---------
dschbaldx:31> uname -smrp
Linux 2.4.20 i686 unknown