The Open Geospatial Consortium, Inc.® (OGC) is a non-profit, international, voluntary consensus standards organization that is leading the development of standards for geospatial and location based services.
Metadata Object Description Schema (MODS) is a schema for a bibliographic element set that may be used for a variety of purposes, and particularly for library applications. The standard is maintained by the Network Development and MARC Standards Office of the Library of Congress with input from users. As an XML schema it 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. richer than Dublin Core. Simpler than the full MARC format (core fields while some specific data may be dropped). an original MARC 21 record converted to MODS may not convert back to MARC 21 in its entirety without some loss
Roughly the specification consists of 2 parts: 1. A schema (in essence DCAT) specifying a serialization of Dataset information, and 2. A protocol / API for getting this information from a compliant data catalogue site.