NIEM has model content for 15 domains, which are community-specific business areas. In addition, several emerging communities are working toward developing data model content, which may lead to the establishment of new domains.
As a community member of NIEM, your involvement could span one or more NIEM domains. You also don’t need to be aligned to a formal NIEM domain to use NIEM, as NIEM’s core elements are universal and applicable to many or all.