Base Infrastructure Schema > ec > ec custom attribute class Edit this page ECCustomAttributeClass ECCustomAttributeClasses define custom metadata which may be applied to any schema item which allows ECCustomAttributes. For a list of schema items which may have a custom attribute applied see CustomAttribute Container Types. Additional Attributes appliesTo The CustomAttribute Container Types defines what ECSchema items an ECInstance of a custom attribute class can be applied to. It can be applied to one or many of ECSchema items. Last Updated: 15 June, 2021