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With a multi-tenant setup, you need to run sem_apis.create_sem_network() in each PDB that you want to use for RDF data. Semantic networks in each PDB are completely independent of each other. It's best not to create a semantic network in CDB$ROOT.
Please do the following in this order:
1) run sem_apis.drop_sem_network() in CDB$ROOT
2) run sem_apis.create_sem_network() in mypdb
3) create models, entailments, etc. in mypdb
In the future, you can run sem_apis.create_semantic_network() in any new pdbs that will be used for RDF data management.
Sorry for the confusion, it seems that our documentation is a bit lacking with respect to these multi-tenant issues.
Thank you very much Matt!