Type of Identifier

DDI 3.2 supports two formats for expressing the Identification Sequence as a URN. The Canonical URN is recommended. The Deprecated URN is a modification of the DDI 3.1 URN. Whether the identification information is expressed as a URN or using the Identification Sequence the attribute “typeOfIdentifier” on the URN dictates the format of the URN supported internally by the agency and the format of the URN used by an external reference to that object. Note that regardless of the type of identifier used it is good practice to provide the full content of the Identification Sequence and details of the MaintainableObject for non-Maintainable objects in order to support the creation of any format of a DDI URN.