That exception message is coming from the WMS server your layer is connected to. It's because the CLIP() expression does not produce a valid WMS GetMap request because the inferred width and height is 0 (that's where the "can not be empty" part is coming from)
Having looked at the WMS provider code in more detail, I think the actual function you want is not CLIP(), but RESAMPLE(). I can't see any working reference usage of CLIP() in any of our FDO client application code. In MapGuide, only RESAMPLE() is used. RESAMPLE takes 2 extra parameters, (width and height), those are the actual values that get sent in the WMS GetMap request that the provider assembles together. So in light of this, is there even a valid usage example for CLIP()? I honestly have no idea 🤷♂️🤷♂️🤷♂️ - Jackie You wrote: I was pulled off this for a while to get another project done. Looking at this again and I was able to get the feature geometry name. However, now I’ve run into a new issue. I’m getting this exception: OSGeo.FDO.Common.Exception: 'InvalidFormat: Parameter 'height' can not be empty. This doesn’t make any sense to me because there is no “height” argument when I check the function arguments. -- *Please Note: I no longer create new posts or post replies to any OSGeo mailing list through nabble. As a result, you most likely won't see this message appear on nabble's view of any OSGeo mailing list and may only see this message through mailing list archives or depending on your mailing list subscription settings, through daily message digests or automated notifications from the mailing lists.*
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