NIEM 5.1

The National Information Exchange Model (NIEM) is a common vocabulary that enables efficient information exchange across diverse public and private organizations. NIEM can save time and money by providing consistent, reusable data terms and definitions, and repeatable processes.

This package contains the full set of NIEM 5.1 XML reference schemas, an XML catalog, and a JSON-LD context file. It also contains spreadsheets that document the content, code lists, and changes in the 5.1 release.

Learn more about NIEM at

Release Package

NIEM 5.1 - The release package includes all NIEM schemas for this release as well as the changelog and spreadsheet.


NIEM Core Schemas

NIEM Domain Schemas

NIEM Auxiliary Schemas

NIEM Code List Schemas

NIEM Adapter Schemas

Special NIEM Schemas