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<div>Dear Frank, dear all,</div>
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<div>I need to highlight a single or a group of POIs and found that MapServer CGI has run-time substitution since version 4.0. </div>
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<div>Does anyone know about the usage of this in mapserver?</div>
<div>Can this feature be made available also for shp2img?</div>
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<div>This would allow to alter portions of a mapfile based on data passed via a command line parameter (or a CGI request in the case of MapServer). Below you find an explanation of this feature taken from <a href="http://mapserver.gis.umn.edu/docs/howto/runsub"><u><font color="#0000ff" size="2">http://mapserver.gis.umn.edu/docs/howto/runsub</font></u></a></div>
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<div>Let's say you'd like the user to dynamically set a portion of an expression so they could highlight a certain land cover class, and you have a form element (called ctype) that allows them to choose between: forest, water, wetland and developed. You could then set up a layer like so: </div>
<div><pre>LAYER
NAME 'covertypes'
...
CLASSITEM 'type'
CLASS # highlighted presentation
EXPRESSION '%ctype%'
...
END
CLASS # default presentation
...
END
END
</pre>
<p>When a request is processed the value for ctype is substituted for the string %ctype% and the mapfile is processed as normal (...). </p></div>