Maintenance

GML attribute	GeoPackage attribute
*	id
gml_id	unique_id
identifier	identifier
localId	local_id
beginLifespanVersion	begin_lifespan_version
netRef_element	netref_element
validFrom	valid_from
maintenanceResponsibility	maintenance_responsibility
maintenanceAuthority	maintenance_authority
maintenanceAuthorityId	maintenance_authority_id
partialReference	partial_reference
highwayAuthority	highway_authority
highwayAuthorityId	highway_authority_id
reasonForChange	reason_for_change