What is metadata?

Metadata, or data about data, provides detailed information that supports the actual content of data instances. Metadata may include details about the origination of data, when it was created, or who authenticated it. Metadata information also helps determine approximate information including the specification of ranges, precision, and patterns, as well as units of measure. The GJXDM/ NIEM metadata methodology uses the basic “Types/Property” scheme, but requires a bit of rigor when creating definitions. Failure to keep in mind the difference between simple and complex types will result in unexpected XML structures. The ability to attach metadata to any field is very important to support semantically rich information sharing. Metadata allows:

 • All GJXDM/ NIEM domain systems to assemble data from various sources while maintaining the origination information.

 • Systems to operate from business rules on data access, ownership, and dissemination that are defined by justice stakeholders.

 • The collection of detailed information regarding when the data was generated, by whom, or how long the information must be