This document standardizes three media types -- application/xml,
application/xml-external-parsed-entity, and application/xml-dtd --
for use in exchanging network entities that are related to the
Extensible Markup Language (XML) while deprecating text/xml and text/
xml-external-parsed-entity. This document also standardizes a
convention (using the suffix '+xml') for naming media types outside
of these five types when those media types represent XML MIME
entities. XML MIME entities are currently exchanged via the
HyperText Transfer Protocol on the World Wide Web, are an integral
part of the WebDAV protocol for remote web authoring, and are
expected to have utility in many domains.
Major differences from [RFC3023] are deprecation of text/xml and
text/xml-external-parsed-entity, the addition of XPointer and XML
Base as fragment identifiers and base URIs, respectively, mention of
the XPointer Registry, and updating of many references.