I have a problem with CDB dataset 309 (geo specific composite material table).

When I use the API (2.8) to open the container file (since xml files are stored in zipped file), the API will fail, the return type of the result CdbFile is descriptive instead of container (“eDescriptive”/” eContainer”). If I ignore the type, and attempt to use the result CdbFile as container (using CdbFile create file method, like any other container), the method returns null, although the file exists in the container.

Any suggestions?

309 is an CDB Extension dataset, when you call Initialize on the CDB API, you need to specify the path to the enhancement file, which is an xml that specifies all of the extension datasets.

m_pCDBApi->initialize(iEnhancements, iEnhancmentCount)