Download the NIEM Reference Model
The NIEM 3 Reference Models are UML representations of the content of the NIEM 3 Release Package XSD files.
They contain packages representing Niem-core, as well as the various Domain schemas included in the NIEM 3 releases, their associated Codes lists and other associated packages. The NIEM 3 reference models are available for download into your Enterprise Architect project, from the Sparx Systems Reusable Asset Server.
Access From the main menu, select 'Package | New'.
In the Model Wizard, click on the 'Model Patterns' tab.
Select the 'Framework' technology, then scroll to locate the NIEM 3.0 items in the right-hand pane.
Select the checkboxes beside the Packages to import, then click on the OK button.