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The Department of Defense Discovery Metadata Specification (DoD Discovery Metadata Specification or DDMS) is a Net-Centric Enterprise Services (NCES) metadata initiative. DDMS is loosely based on the Dublin Core vocabulary. DDMS defines discovery metadata elements for resources posted to community and organizational shared spaces. It is sometimes (incorrectly) referred to as ''DoD Discovery Metadata Standard''. The project focuses both on the process of developing a central taxonomy for metadata, and defining a way of discovering resources by their metadata using that taxonomy. The DDMS was created in support of the DoD Net-Centric Data Strategy (dated May 9, 2003), and specifies a set of information fields that are to be used to describe any data or service asset that is made known to the DoD Enterprise. The elements in the DDMS are designed to be platform, language, and implementation-independent, and the specification is described with an XML Schema. ==Structure== The DDMS is designed using a layered approach, combining a Core Layer and an Extensible Layer surrounded by the DDMS Resource Header. The Core Layer is composed of five sets of element categories, each with a specific functional focus for describing a data asset: * The Metacard elements describe the DDMS resource itself. * The Security elements enable the description of security classification of the described resource, Need-to-Know (NTK) information, and related notices. * The Resource elements enable the description of maintenance and administration information. * The Summary Content elements enable the description of concepts and topics. * The Format elements enable the description of physical attributes of the asset. * The Extensible Layer is designed to support domain-specific or Community of Interest (COI) discovery metadata requirements, and can be used to extend the element categories identified in the Core Layer. Extensions are expected to be registered in the (DoD Metadata Registry ). Extensible attribute spaces are also provided on some elements. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Department of Defense Discovery Metadata Specification」の詳細全文を読む スポンサード リンク
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