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Dia shapes for chemistry

I've just gone through the manuals and learned how to define new shapes 
and sheets for Dia. I'm really impressed with how easy it is, but had a 
few questions that I was hoping that someone could answer.

Here's an example of one of the structures I've defined:

<?xml version="1.0"?>

<shape xmlns="http://www.daa.com.au/~james/dia-shape-ns";
   <name>Chemistry - Benzene</name>
   <description>Basic six-membered ring</description>
    <point x="1.0" y="0"/>
    <point x="0.5" y="0.866"/>
    <point x="-0.5" y="0.866"/>
    <point x="-1.0" y="0"/>
    <point x="-0.5" y="-0.866"/>
    <point x="0.5" y="-0.866"/>
   <svg:svg width="4.0" height="4.0">
     <svg:polygon points="1.0,0.0 0.5,0.866 -0.5,0.866 -1.0,0.0 
-0.5,-0.866 0.5,-0.866"/>
     <svg:line x1="0.8" y1="0" x2="0.4" y2="0.693"/>
     <svg:line x1="-0.4" y1="0.693" x2="-0.8" y2="0"/>
     <svg:line x1="-0.4" y1="-0.693" x2="0.4" y2="-0.693"/>

1. I would like to constrain the resizing so that if I change x, y is 
changed the same amount. Is there a way of doing this in SVG?

2. I would like to optionally label each vertex with a letter (e.g. "C" 
or "N"). Is there an easy way of doing this?

Thanks in advance for any help you can offer.


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