The following 2 XML Namespace values were found in all available specifications. Please be advised that the table shown here is maintained and compiled from Web Concepts sources. The official XML Namespace registry is maintained by the Internet Assigned Numbers Authority (IANA).

XML Namespace Specification
urn:ietf:params:xml:ns:common-policy RFC 4745: Common Policy: A Document Format for Expressing Privacy Preferences
urn:ietf:params:xml:schema:ECMLv2 RFC 4112: Electronic Commerce Modeling Language (ECML) Version 2 Specification