What is the DocumentType component?
The GJXDM and NIEM contain DocumentType components from which standard XML document schemas can be derived. The DocumentTypes include commonly used properties such as control and records management metadata, security and classification metadata, and general document descriptive metadata.
Within its own target namespace, each reference document schema will import the GJXDM or NIEM namespace (or a subset of them) and extend DocumentType for its root element. For example, a CitationDocument schema would import the GJXDM or NIEM namespace and create
(1) a CitationDocumentType that extends DocumentType and
(2) a complex root element CitationDocument of type CitationDocumentType. Consequently, CitationDocumentType inherits all of the standard metadata properties of DocumentType, however, each document designates its own target namespace, enabling local document customization and preventing name conflicts.