Required metadata for each PORTAL data record:

• the resource label with a globally unique URI (or IRI) required by the generic PORTAL registry type for identification of the resource in the PORTAL-DOORS system;
• the resource owner with contact information for the personnel who own and manage the resource;
• the DOORS directories with URLs (or IDNs) for the primary and secondary DOORS directories that publish the metadata not maintained at the PORTAL registry.

• the resource tags with character strings permitted by the policies of the specific PORTAL registry type;
• the resource cross-references with any globally unique identifiers permitted by the policies of the specific PORTAL registry type for identification of the resource in other systems unrelated to PORTAL-DOORS;
• the owner signature with the XML-Signature of the owner permitted by the generic PORTAL registry type;
• any other metadata permitted by the policies of the specific PORTAL registry type.