The term metadata is often defined as “data about data” but that circular reference does little to describe what constitutes metadata and how it is used. Here, we will focus on metadata as conceived to support the concepts of a service-oriented architecture and, in particular, as it relates to the DoD Net-Centric Data Strategy and the NCES core services; more specifically, what types and structure of metadata are implied by current use cases, what functions are implied to support creating maintaining, and using such metadata, and what is implied about a metadata infrastructure that would support such metadata and its related functions.

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