PropertyHandle :: GetBaseProperty - Get collection handle for base collection
The function returns the base collection property handle when a base collection has been defined for the collection (relationship or extent). Otherwise the function returns NULL.
The returned property handle is a sub handle for the current property handle, i.e. the base collection will change automatically whenever the collection in the current property handle changes.
Return value: Pointer to property handle ( PropertyHandle * )
Is a pointer to an (usually) opened property handle.