Need a way to control layer legend labels via WMS

[dmorissette]

In bug 653, we need a way to use the "WMS_TITLE" metadata as the legend label
for a graphic legend image produced by GetLegendGraphic.

Normally, it's the NAME of the layer that is used as the label in a graphic
legend, but in the case of WMS layers, the name is usually a shorter unique
string, and the WMS_TITLE is the human-readable version.

I'd hate to have to hack something in the graphical legend code to support
reading label values from metadata... but is there any other options?

Any thoughts? Suggestions?

[sdlime]

There is an attribute in classObj called "title" that was intended for legend 
labels, with "name"'s becoming truly unique. I wanted a way to control class 
parameters via a URL and names, unless short and unique, are bad for that. The 
class title is already supported in the mapfile reader so you could leverage 
that. What about a function like msGetLegendLabel that would get the label 
with this priority:

 - class title
 - OWS/WMS_TITLE
 - class name

Steve