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Information Sciences] 
n., Data describing data and data systems; that is the structure of databases, their characteristics, location and usage. [Archives]
n., Structured or semi-structured information which enables the creation, management and use of records through time and
n., The markup characters that indicate the start or end of a data element in an SGML-compliant document. A tag serves as an instruction to a processing or reading program, specifying how the data element is defined or displaye