Enum XmlSchemaUse Path C++ Link System.Xml.Schema.XmlSchemaUse, System.Xml underlying int32 System.Xml.dll Values 4 NameValueHex None00x00Optional10x01Prohibited20x02Required30x03 Used by 1types with a member, parameter or interface of this type XmlSchemaAttribute // System.Xml.Schema.XmlSchemaUse, System.Xml enum class XmlSchemaUse : int32 { None = 0, Optional = 1, Prohibited = 2, Required = 3, };