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.
This is an experimental service that makes the Library of Congress Subject Headings available as linked-data using the SKOS vocabulary. The goal of lcsh.info is to encourage experimentation and use of LCSH on the web with the hopes of informing a similar effort at the Library of Congress to make a continually updated version available. More information about the Linked Data effort can be found on the W3C Wiki.
The FRBR Display Tool, based on the above analysis, is an XSLT program that transforms the bibliographic data found in MARC record retrieval files into meaningful displays by grouping the bibliographic data into the "Work," "Expression" and "Manifestation