.. _exhale_define__ifc2x3-definitions_8h_1a56af4767e6d2d115acec05cfa4d77dee:

Define SCHEMA_IfcConstructionMaterialResource_UsageRatio_IS_OPTIONAL
====================================================================

- Defined in :ref:`file_src_ifcparse_Ifc2x3-definitions.h`


Define Documentation
--------------------


.. doxygendefine:: SCHEMA_IfcConstructionMaterialResource_UsageRatio_IS_OPTIONAL