The Library of Congress' Network Development and MARC
Standards Office, with interested experts, has developed a schema for
a bibliographic element set that may be used for a variety of purposes,
and particularly for library applications. As an XML schema, the "Metadata
Object Description Schema" (MODS) is intended to be able to carry
selected data from existing MARC 21 records as well as to enable the creation
of original resource description records. It includes a subset of MARC
fields and uses language-based tags rather than numeric ones, in some
cases regrouping elements from the MARC 21 bibliographic format. MODS
is expressed using the XML schema
language of the World Wide Web Consortium.
The standard is maintained by the
Network Development and MARC Standards Office of the Library of Congress
with input from users.
schema version 3.0 is now available. A list
of changes from version 2.0 that were applied is available.