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XCAFDoc_VisMaterialCommon and XCAFDoc_VisMaterialPBR default constructors now set IsDefined property to TRUE. So that it is required to set IsDefined=false explicitly to create an undefined material, which is done by XCAFDoc_VisMaterial constructor. Existing application code shouldn't require any modifications in most cases (IsDefined=true required before to setup material could be now removed).