3.7 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 on the A3DRootBaseData structure as either a string m_pcPersistentId, or an integer m_uiPersistentId. See the table below for information on how persistent IDs are supported.
File Type | Assemblies Node | 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 integer (key) | 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 integer (key) | 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 integer (key) | Persistent ID integer (key) | Persistent ID string as an attribute | Not implemented | In ProductInformation (for each occurrence corresponding to a file) |
Inventor | Persistent ID integer (key) | Persistent ID integer (key) | Persistent ID string as an attribute | Not implemented | In ProductInformation (for each occurrence corresponding to a file) |