To assist users of other metadata standards, field mappings to equivalent elements in other standards are provided. These elements were selected to represent information that is most often looked for on the web.
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This specification defines three types of metadata elements: Required, Required-if (conditionally required), and Expanded fields. The metadata schema specified in this memorandum is based on DCAT, a hierarchical vocabulary specific to datasets. Making metadata machine readable greatly increases its utility, but requires more detailed standardization, defining not only field names, but also how information is encoded in the metadata fields.Įstablishing a common vocabulary is the key to communication.
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Metadata can range from basic to advanced, from allowing one to discover the mere fact that a certain data asset exists and is about a general subject all the way to providing detailed information documenting the structure, processing history, quality, relationships, and other properties of a dataset. The more information that can be conveyed in a standardized regular format, the more valuable data becomes. The challenge is to define and name standard metadata fields so that a data consumer has sufficient information to process and understand the described data. Metadata is structured information that describes, explains, locates, or otherwise makes it easier to retrieve, use, or manage an information resource (NISO 2004, ISBN: 1-88).
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Additional technical information about the schema can be found on the Metadata Resources page. This section contains guidance to support the use of the Project Open Data metadata to list agency datasets and application programming interfaces (APIs) as hosted at /data. DCAT-US Schema v1.1 (Project Open Data Metadata Schema)