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Metadata elements grouped into sets designed for a specific purpose, e.g., for a specific domain or a particular type of information resource, are called metadata schemas. For every element the name and the semantics (the meaning of the element) are specified.
The metadata standard is an application profile of the Dublin Core Metadata Element Set and consists of mandatory, recommended and optional metadata elements such as title, date created and description. The e-GMS formed part of the e-Government Metadata Framework (e-GMF) and eGovernment Interoperability Framework (e-GIF).
Every level requires that the DACS metadata elements from the previous levels are complete, and that the relationship between the current level and previous levels are clearly presented. [10] The rest of Part I defines the metadata elements required for each level of description.
Metadata schemata can be hierarchical in nature where relationships exist between metadata elements and elements are nested so that parent-child relationships exist between the elements. An example of a hierarchical metadata schema is the IEEE LOM schema, in which metadata elements may belong to a parent metadata element.
Similar in structure to AACR2, [4] RAD provides archivists with a framework for generating archival descriptions and finding aids. It is a multi-level descriptive metadata standard structured to reflect the context of a group of records based on the manner in which they were created, used, and managed. [5] [6]
It provided a simple, flat element set that could be used Qualified Dublin Core was developed in the late 1990s to provide an extension mechanism to the vocabulary of 15 elements. This was a response to communities whose metadata needs required additional detail. [11] In 2012, the DCMI Metadata Terms was created using a RDF data model. [12]
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In addition to the development and maintenance work done by the Society of American Archivists and the Library of Congress, the Research Libraries Group (RLG) has developed and published a set of "Best Practice" implementation guidelines [19] for EAD, which lays out mandatory, recommended, and optional elements and attributes.