Document_structure_arm
short long

eu	Digital_document_definition
eu	Digital_file
eu	Document
eu	Document_definition
e	Document_definition_relationship
eu	Document_location_identification
du	Document_location_select
eu	Document_version
du	External_identification_item
eu	External_item_identification
eu	External_source_identification
eu	File
eu	File_location_identification
e	File_relationship
eu	Hardcopy
du	Located_select
eu	Physical_document_definition
eu	Product
eu	Product_category
eu	Product_category_assignment
eu	Product_category_hierarchy
eu	Product_version
eu	Product_view_definition
eu	View_definition_context