The NIEM 4.2 Release Candidate 1 (RC1) package is available at NIEM-Releases for public review and comment. The package includes XML schemas, documentation spreadsheets, a change log, a JSON-LD context file, and a README.
The RC1 is a draft of the NIEM 4.2 minor release. It includes considerable contributions from Biometrics, Emergency Management, and the Justice domains.
The NIEM 4.2 minor release will be published Fall 2019.