Adding Geometric data to Catalog Items

Hi,

Does anyone know how I can create a Definition File to add to a DataGroup Catolog item, which would return geometric values relating to the modelled items?

For example: I draw a number of horizontal planes at different levels, and "Add Instance Data" to place them in the catalog. I then want their Z-values to report in DataGroup Explorer.

The slab tool somehow achieves this via the SlabQuantities.xsd definition file, which returns a "Top of Slab" figure. Unfortunately I can't replicate this even by adding the SlabQuantities.xsd to my Catalog Item.

Any suggestions appreciated...   

 

Mark

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