PRODUCT_STRUCTURE_SCHEMA
short long

e	Alternate_product_relationship
e	Assembly_component_usage
e	Assembly_component_usage_substitute
e	Assembly_component_usage_substitute_with_ranking
e	Make_from_usage_option
e	Make_from_usage_option_group
e	Next_assembly_usage_occurrence
e	Product_definition_occurrence_relationship
e	Product_definition_usage
e	Promissory_usage_occurrence
e	Quantified_assembly_component_usage
e	Specified_higher_usage_occurrence