text: --create new Relationship_id for PPI
  DO $_$
  BEGIN
  	PERFORM vocabulary_pack.AddNewRelationship(
  	pRelationship_name			=>'Has question source',
  	pRelationship_id			=>'Has question source',
  	pIs_hierarchical			=>0,
  	pDefines_ancestry			=>0,
  	pReverse_relationship_id	=>'Question source of',
  	pRelationship_name_rev		=>'Question source of',
  	pIs_hierarchical_rev		=>0,
  	pDefines_ancestry_rev		=>0
  );
  END $_$;
  
  --create new classes for PPI
  DO $_$
  BEGIN
  	PERFORM VOCABULARY_PACK.AddNewConceptClass(
  	pConcept_class_id	=>'Question source',
  	pConcept_class_name	=>'Question source'
  );
  END $_$;