Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Metadata standards are requirements which are intended to establish a common understanding of the meaning or semantics of the data, to ensure correct and proper use and interpretation of the data by its owners and users. To achieve this common understanding, a number of characteristics, or attributes of the data have to be defined, also known as metadata. Metadata is often defined as data about data . It is "structured information that describes, explains, locates, or otherwise makes it easier to retrieve, use or manage an information resource", especially in a distributed network environment like for example the internet or an organization. A good example of metadata is the cataloging system found in libraries, which records for example the author, title, subject, and location on the shelf of a resource.

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