Getting multiple GetLegendGraphic layers

[James Net]

Hi list,

I was wondering how to request more than a single layer when requesting a 
Legend graphic?

For example,
http://my_server/cgi-bin/mapserv?map=my_map.map&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetLegendGraphic&LAYER=water_line&FORMAT=image/png

would return the key/legend for the water_line layer.

How do I request and return more than one layer's key/legend on the same 
generated image?

For example,
http://my_server/cgi-bin/mapserv?map=my_map.map&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetLegendGraphic&LAYER=water_line, 
water_point, water_polygon&FORMAT=image/png

Can it be done?

Also, the layers "water_line", "water_point" and "water_polygon" all belong 
to the same group named "water".

I would do this:
http://my_server/cgi-bin/mapserv?map=my_map.map&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetLegendGraphic&LAYER=water&FORMAT=image/png

but it seems to fail.

Can it be done at all?

Thanks in advance!

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