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<p><font size="4">Separate the model and the view.<br>
</font></p>
<p><font size="4">Have a model (city, road, river), represented by
one or several view (morph).</font></p>
<p><font size="4">Relationship will be established at the model
level.</font></p>
<p><font size="4">Try to read some documentation about separated
model and view. I don't have any to recommend.</font></p>
<p><font size="4">Hilaire<br>
</font></p>
<pre class="moz-signature" cols="72">--
GNU Dr. Geo
<a class="moz-txt-link-freetext" href="http://gnu.org/s/dr-geo/">http://gnu.org/s/dr-geo/</a>
<a class="moz-txt-link-freetext" href="http://gnu-drgeo.blogspot.com/">http://gnu-drgeo.blogspot.com/</a></pre>
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