OptionalcategoryOptionalconstituentsOptionaldescriptionOptionallayersOptionalmaterialsMembers of an IfcMaterialList. Each entry surfaces the material's Name plus optional Category — IDS material checks match against either, so callers must propagate both.
OptionalnameOptionalprofilesOptionalunresolvedThe graph proves a material association, but this store has no source bytes to read it (server-parsed, #5227). Every other field is unset.
IfcMaterial.Category (IFC4+).