IHE IT Infrastructure Technical Framework (Profiles)
Volume 1: Profile definition, use-case analysis, actor definition, and use of transactions and content
Volume 2: Transaction definitions and constraints
Volume 3: Document Sharing Metadata and Content Profiles
Volume 4: National Extensions
Final Text (Approved) Change Proposals: Change Proposals (CPs) are periodically integrated into ITI Technical Framework Volumes and Trial Implementation Supplements. A log of approved CPs is found here and closed GitHub issues are here. Final Text CPs may be testable at IHE Connectathons before they are integrated into Technical Framework documents.
The ITI Technical Framework has been published here in HTML format since version 17 in March of 2021. Archives of the HTML publication since version 17 are available in the IHE GitHub publications archive. The ITI Technical Framework prior to version 17 are published in PDF format and archives are available on the ITI www.ihe.net archive page.