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In metadata, a data element definition is a human readable phrase or sentence associated with a data element within a data dictionary that describes the meaning or semantics of a data element. Data element definitions are critical for external users of any data system. Good definitions can dramatically ease the process of mapping one set of data into another set of data. This is a core feature of distributed computing and intelligent agent development. There are several guidelines that should be followed when creating high-quality data element definitions. == Properties of clear definitions == A good definition is: # Precise - The definition should use words that have a precise meaning. Try to avoid words that have multiple meanings or multiple word senses. # Concise - The definition should use the shortest description possible that is still clear. # Non Circular - The definition should not use the term you are trying to define in the definition itself. This is known as a circular definition. # Distinct - The definition should differentiate a data element from other data elements. This process is called disambiguation. # Unencumbered - The definition should be free of embedded rationale, functional usage, domain information, or procedural information. A data element definition is a required property when adding data elements to a metadata registry. Definitions should not refer to terms or concepts that might be misinterpreted by others or that have different meanings based on the context of a situation. Definitions should not contain acronyms that are not clearly defined or linked to other precise definitions. If one is creating a large number of data elements, all the definitions should be consistent with related concepts. Critical Data Element – Not all data elements are of equal importance or value to an organization. A key metadata property of an element is categorizing the data as a Critical Data Element (CDE). This categorization provides focus for data governance and data quality. An organization often has various sub-categories of CDEs, based on use of the data. e.g., # Security Coverage – data elements that are categorized as personal health information or PHI warrant particular attention for security and access # Marketing Department Usage – the marketing department could have a particular set of CDEs identified for identifying Unique Customer or for Campaign Management # Finance Department Usage – the Finance department could have a different set of CDEs from Marketing. They are focused on data elements which provide measures and metrics for fiscal reporting Standards such as the ISO/IEC 11179 Metadata Registry specification give guidelines for creating precise data element definitions. Specifically chapter four of the ISO/IEC 11179 metadata registry standard covers data element definition quality standards (). 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「data element definition」の詳細全文を読む スポンサード リンク
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