Secure Intelligence Data Repository (SIDR)
In order to provide an authoritative source for DoD data standards, the DoD created the Defense Data Dictionary System (DDDS). The DDDS, managed by DISA, is a DoD-wide central database that includes standard data entities, data elements, and access to data models. The DDDS is used to collect individual data standards derived from the DoD data model (DDM) and to document content and format for data elements.
Sponsored by the Defense Intelligence Agency and the National Security Agency (NSA), a classified version of the DDDS, known as the Secure Intelligence Data Repository (SIDR), has been developed to support standardization of classified data elements and domains. System developers use these repositories as primary source of data element standards.
DoD Directive (DoDD) 8320.1 provides the procedures for Data Administration. The mandated standards for DoD Data Definitions are:
- DoDD 8320.1, Data Administration
- DoD 8320.1-M-1, DoD Data Standardization Procedures
- Defense Data Dictionary System (DDDS)
- Secure Intelligence Data Repository (SIDR), Version 1.0, May 1997
The USIGS Conceptual Data Model reflects existing data models reflecting standardized data elements or candidate standard elements as contained in the Defense Data Dictionary System (DDDS) and Secure Intelligence Data Repository (SIDR), as well as existing Imagery and Geospatial Community-related Shared Data Environment (SHADE) reusable Reference Data Sets and Database Segments.
Three necessary data characteristics must be known to define interoperable databases. First, the contextual view of data must be developed to understand how data elements interact with each other. Second, the data element definitions must be unambiguous. Third, the foreign key identifiers must be defined in parent-to-child data relationships. These characteristics are contained within the combination of activity models, data models, and data element definitions.
Information exchange is accomplished for the most part by sending formatted messages. The definition and documentation of these exchange mechanisms are provided by various messaging standards. Each message standard provides a means to define message form and functions (i.e., transfer syntax), which includes the definition of the message elements that are contained in each message. The message fields, which are currently defined in the various message standards, are not necessarily mutually consistent, nor are they consistently based on any activity or data models either within a message system or across message systems. Newer techniques provide direct database-to-database exchange of data without the user following a rigid format. A model-based structure will eventually provide definitions which will be data elements-based and will be compliant with the defense data element standards established in accordance with the DoD Directive (DoDD) 8320.1, Data Administration, and associated DoD 8320.1 manuals.
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