Persistent IDs

HOOPS Exchange supports the concept of persistent IDs for certain file formats. Persistent IDs are important for those developers drawing data from many CAD systems since IDs assigned to model entities are persistent across different sessions.

Persistent IDs are stored as a field in the A3DRootBaseData structure as either a string A3DRootBaseData.m_pcPersistentId or an integer A3DRootBaseData.m_uiPersistentId. To retrieve the persistent ID for assembly nodes, call A3DAsmProductOccurrenceGetIdentifier(). See the table below for information on how persistent IDs are supported.

File Type	Assembly Nodes	Solids	Faces	Edges	Density
CATIA V5	Persistent ID string (CLSID)	Persistent ID integer (key)	Persistent ID string as attribute (string)	Persistent ID string as attribute	In ProductInformation (for each occurrence corresponding to a file)
Creo/Pro-E	Persistent ID string (CLSID)	Not applicable	Persistent ID integer (key) - Note: Persistent ID inside a part are different even when there are several solids.	Persistent ID integer (key) - Note: Persistent ID inside a part are different even when there are several solids.	Latest versions of Creo have them. Otherwise, we put the stored filename.
NX	Persistent ID string (CLSID)	Persistent ID integer (key)	Persistent ID integer (key)	Persistent ID integer (key)	In ProductInformation (for each occurrence corresponding to a file)
SolidWorks	Persistent ID string (CLSID)	Persistent ID integer (key)	Not applicable	Not implemented	In ProductInformation (for each occurrence corresponding to a file)
JT	Not applicable	Not applicable	Not applicable	Not applicable	In ProductInformation (for each occurrence corresponding to a file)
SolidEdge	Persistent ID string (CLSID)	Persistent ID integer (key)	Persistent ID string as an attribute	Not implemented	In ProductInformation (for each occurrence corresponding to a file)
Inventor	Persistent ID string (CLSID)	Persistent ID integer (key)	Persistent ID string as an attribute	Not implemented	In ProductInformation (for each occurrence corresponding to a file)