From the technical introduction:
NIEM provides a common vocabulary for consistent, repeatable exchanges of information between agencies and domains. The model is represented in a number of forms, including a data dictionary and a reference schema, and includes the body of concepts and rules that underlie its structure, maintain its consistency, and govern its use.
NIEM is a comprehensive resource for organizations to successfully exchange information, offering tools, terminology, help, training, governance, and an active community of users.
NIEM uses extensible markup language (XML), which allows the structure and meaning of data to be defined through simple but carefully defined syntax rules and provides a common framework for information exchange.
The model’s unique architecture enables data components to be constrained, extended, and augmented as necessary to formulate XML exchange schemas, and XML instance documents defining the information payloads for data exchange. These exchange-defining documents are packaged in information exchange package documentation (IEPDs) that are reusable, modifiable, and extendable.
It’s Labor Day and I have yet to get the “tools” link to work. Must be load on the site.
It’s a large effort and site so it will take some time to explore it.
If you are participating in < NIEM > please give a shout.
PS: I encountered < NIEM > following a link to the 2011 National Training Event videos. Registration is required but free.