.. _exhale_define__ifc4x3__rc1-definitions_8h_1aedfcad2f33855bb948d236bd5c0a57df: Define SCHEMA_IfcMaterialRelationship_Expression_IS_OPTIONAL ============================================================ - Defined in :ref:`file_src_ifcparse_Ifc4x3_rc1-definitions.h` Define Documentation -------------------- .. doxygendefine:: SCHEMA_IfcMaterialRelationship_Expression_IS_OPTIONAL