I ran Oracle 23ai using VirtualBox appliance and followed Oracle's guide "2.1 Getting Started with Semantic Data in a Schema-Private Network" from https://docs.oracle.com/en/database/oracle/oracle-database/23/rdfrm/getting-started-rdf-data-schema-private-network.html .
[oracle@localhost ~]$ sqlplusEnter user-name: sys as sysdbaEnter password: oracleConnected to:Oracle Database 23ai Free Release 23.0.0.0.0 - Develop, Learn, and Run for FreeVersion 23.4.0.24.05SQL> CREATE TABLESPACE rdf_tblspace DATAFILE 'rdf_tblspace.dat' SIZE 1024M REUSE AUTOEXTEND ON NEXT 256M MAXSIZE UNLIMITED SEGMENT SPACE MANAGEMENT AUTO;Tablespace created.SQL> CREATE USER rdfuser IDENTIFIED BY Password99 QUOTA 5G ON rdf_tblspace;User created.SQL> GRANT CONNECT, RESOURCE, CREATE VIEW TO rdfuser;Grant succeeded.SQL> CONNECT rdfuser/Password99Connected.SQL> EXECUTE SEM_APIS.CREATE_SEM_NETWORK('rdf_tblspace', network_owner=>'rdfuser', network_name=>'rdfnetwork');BEGIN SEM_APIS.CREATE_SEM_NETWORK('rdf_tblspace', network_owner=>'rdfuser', network_name=>'rdfnetwork'); END;*ERROR at line 1:ORA-13199: Error during RDF Network creation: step_num=2.2ORA-04067: not executed, package body "SYS.SDO_RDF_SYS" does not existORA-06508: PL/SQL: could not find program unit being called: "SYS.SDO_RDF_SYS"RDF_EBTRC [ORA-06512: at "MDSYS.SDO_RDF_INTERNAL", line 32175]ORA-06512: at "MDSYS.SDO_RDF_INTERNAL", line 33028ORA-06512: at "MDSYS.SDO_RDF_INTERNAL", line 33002ORA-06512: at "MDSYS.MD", line 1723ORA-06512: at "MDSYS.MDERR", line 17ORA-06512: at "MDSYS.SDO_RDF_INTERNAL", line 32987ORA-06512: at "MDSYS.SDO_RDF_INTERNAL", line 33024ORA-06512: at "MDSYS.SDO_RDF", line 19006ORA-06512: at "MDSYS.SDO_RDF", line 19040ORA-06512: at "MDSYS.RDF_APIS", line 3206ORA-06512: at line 1Help: https://docs.oracle.com/error-help/db/ora-13199/ORA-13199 is an internal error. Am I missing some steps?