This schema 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.
The Library of Congress' Network Development and MARC Standards Office is developing a framework for working with MARC data in a XML environment. This framework is intended to be flexible and extensible to allow users to work with MARC data in ways specific to their needs. The framework itself includes many components such as schemas, stylesheets, and software tools.
This list provides a quick overview of the landscape of open-source bibliographic software; both where is has been, but more importantly, where it may yet go.