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Mapping Document. The Mapping Document is a tool used to bridge the gap between exchange data and the data objects reused from the NIEM data model. The Mapping Document is a standardized document used to identify how exchange data aligns to, or âmaps,â and reuses NIEM data objects.The Mapping Document is a local âdata dictionaryâ of NIEM XML data objects, local exchange data objects, and the relationship between the two.he Mapping Document is a tool used to bridge the gap between exchange data and the data objects reused from the NIEM data model.
From Wikipedia, the free encyclopedia. In computing and data management, data mapping is the process of creating data element mappings between two distinct data models. Data mapping is used as a first step for a wide variety of data integration tasks including:1  Data transformation or data mediation between a data source and a destination. 2  Identification of data relationships as part of data lineage analysis.ata mapping is used as a first step for a wide variety of data integration tasks including: 1  Data transformation or data mediation between a data source and a destination. 2  Identification of data relationships as part of data lineage analysis.