# Version and commit

**Category:** [Technical (archive)](https://discourse.openehr.org/c/technical-archive/156)
**Created:** 2006-03-08 05:24 UTC
**Views:** 6
**Replies:** 1
**URL:** https://discourse.openehr.org/t/version-and-commit/12068

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## Post #1 by @Sam

Dear All

Heath and I have been discussing issues about commiting and attesting data. We want to be able to attest something that is immutable - the data of the composition and the commit details. There are two types of versioned data (page 41 of the Common IM) - the Version and the imported version.

The parts that need to be immutable are:

- UID
- preceding_version_id
- lifecycle_state
- create_audit - (presently a function which calls the commit_audit if not imported and the original_create_audit if it is imported)

- data
In the Ocean implementation we store the composition as a blob and would like to store everything that is immutable - nothing that changes (e.g. attestations, contribution ID etc). I have proposed that this set of attributes makes up the X_Version - that information to send as part of an extract - as it is unchanging. Heath is keen to have the Version be able to deal with this and store it consistently - he would like to make the reference model deal with this more elegantly. He has suggested that we change what is now called commit_audit to create_audit and change the IMPORTED_VERSION original_create_audit to local_commit_audit.

This would mean that commit_audit became a function on each class (now called create_audit) returning the create_audit on the VERSION and the local_commit_audit on the IMPORTED_VERSION.

Any ideas - it is a very minor change but I think meets both our needs.

Cheers, Sam

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## Post #2 by @Heath_Frankel

Actually I suggested Import_Commit_Audit not Local_Commit_Audit.

Heath

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**Canonical:** https://discourse.openehr.org/t/version-and-commit/12068
**Original content:** https://discourse.openehr.org/t/version-and-commit/12068