The  GeoServer doc uses two different terms to refer to SLD variable
substitution.  I would like to make this consistent in the User Guide, so
I'm asking for comments on which one should be the standard wording.

The WMS GetMap vendor parameter page uses "variable substitution":

http://docs.geoserver.org/stable/en/user/services/wms/vendor.html#env

The SLD section uses "parameter substitution":

http://docs.geoserver.org/stable/en/user/styling/sld-extensions/substitution.html

I lean towards using "variable substitution", for the following reasons:

- the use of the "env" seems like a reference to UNIX-style environment
*variables*
- the word "parameter" is easy to confuse with the concept of WMS request
parameters, since both are used in the same context

Thoughts?


-- 
Martin Davis
OpenGeo - http://opengeo.org
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