What is meaning of swDocumentTypes_e::swDocIMPORTED_PART or swDocumentTypes_e::swDocIMPORTED_ASSEMBLY?

Hello,

 There are different swDocumentTypes_e in SolidWorks. In that what is the meaning of  swDocumentTypes_e::swDocIMPORTED_PART  and swDocumentTypes_e::swDocIMPORTED_ASSEMBLY?

If available please share the test case of it.

SolidworksApi/macros