CAD — Incompletely specified operations - issue

Mikhail Kazakov mentioned that some of the Cad Services interfaces may be under-specified. Here is a list of operations needing additional documentation:
1. CadMain:: open_model( …) - the question involves whether this operation loads the specified model into memory or are all the available models in memory and the open_model() operation merely returns an object reference to the model.

Recommendation: the documentation should include the following: The open_model() operation loads the specified model into memory and can be unloaded by invoking close_model() on the Model object reference.

2. CadMain:: top_level_entities (in CadUtility::TypeCodeSeq entity_types) - what happens when an empty TypeCodeSeq is passed? One could respond with all top level entities or none.
Recommendation: Documentation shall state that an empty TypeCodesSeq will result in a system exception (BAD_PARAM).

3. unsigned long unique_entities_count (in CadUtility::TypeCodeSeq entity_types) raises (NotValidCadType, CadUtility::CadError); - what happens when an empty TypeCodeSeq is passed? One could respond with all entites or none.
Recommendation: Documentation shall state that an empty TypeCodesSeq will result in a system exception (BAD_PARAM).

4. CadFoundation::EntitySeq unique_entities (in CadUtility::TypeCodeSeq entity_types) raises (NotValidCadType, CadUtility::CadError); – what happens when an empty TypeCodeSeq is passed? One could respond with all entites or none.
Recommendation: Documentation shall state that an empty TypeCodesSeq will result in a system exception (BAD_PARAM).

The identified recommendations were agreed.