The Schema Subset Generation Tool (SSGT) enables you to search and explore the content of the NIEM model. Additionally, you have the option of building XML Schema subsets of a NIEM release for use in NIEM XML exchanges. Based on the list of components selected by you for the subset, the tool will calculate dependencies and generate a valid set of schemas that are a subset of a release for download as a zip file.
A NIEM subset will contain only the user-selected elements and types from a release, plus any required dependencies. The subset will likely be much smaller than the corresponding full NIEM release.