NIEM specifications provide rules and guidance in order to design consistent and well-defined information exchanges. Specifications are managed by the NIEM Technical Architecture Committee (NTAC).
View and search rules from the specifications below in the NIEM Specification Rule Browser.
The following NIEM specifications have drafts ready for review, with feedback requested by Friday, February 26, 2021.
NIEM Naming and Design Rules (NDR) Specification
The NIEM Naming and Design Rules (NDR) describe the architecture of the NIEM data model and its representation in XML. It specifies principles and enforceable rules for NIEM data components and schemas.
NIEM Model Package Description (MPD) Specification
The NIEM Model Package Description (MPD) Specification specifies normative rules and non-normative guidance for building NIEM information exchange messages. It defines IEPD artifacts like subset schemas, extension schemas, and MPD catalogs; and recommends how the package should be structured.
NIEM JSON Specification
NIEM Conformance Specification
The Conformance Specification specifies general conformance guidance, principles, and rules for NIEM.
NIEM Conformance Targets Attribute Specification
The Conformance Targets Attribute Specification (CTAS) defines how NIEM XML documents classify what kind of artifact they are through the use of a conformance targets attribute.
NIEM Code Lists Specification
The Code Lists Specification adds support for new capabilities of NIEM code lists beyond the basic enumeration representations provided by XML and JSON schema. Key features include the definition of codes in CSV or Genericode files, dynamic code lists via run-time binding, and multi-column code table support.
NIEM High-Level Version Architecture (HLVA) Specification
The NIEM High-Level Version Architecture (HLVA) Specification identifies the processes, artifacts, and responsibilities required to produce new releases of the NIEM model. It also establishes a regular release cycle for predictable and manageable NIEM updates.