I'm using ArcGIS Desktop 10 and working on a WMS service with Mars data. Currently the GetCapabilities shows
<SRS>EPSG:4326</SRS>. I assume ArcGIS 10 reads this and therefore the WMS has GCS_WGS_1984 as a Geographic Coordinate System?
I would like to use a custom URL definition because I am working with data from Mars. Is it for example possible to add a URL with GML such as http://spatialreference.org/ref/iau2000/49900/gml/ ?