# openEHR Basic Meta-Model (BMM) and syntax major upgrade

**Category:** [Technical (archive)](https://discourse.openehr.org/c/technical-archive/156)
**Created:** 2018-07-16 13:15 UTC
**Views:** 3
**Replies:** 0
**URL:** https://discourse.openehr.org/t/openehr-basic-meta-model-bmm-and-syntax-major-upgrade/14389

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## Post #1 by @system

I have created a [new blog post](https://wolandscat.net/2018/07/16/openehr-basic-meta-model-bmm-and-syntax-major-upgrade/) on the latest BMM upgrade. From the post:

The openEHR [Basic Meta-Model (BMM)](https://www.openehr.org/releases/BASE/latest/docs/bmm/bmm.html) that has been in use in some form for nearly 10 years now was recently upgraded to version 3.0.0 (from 2.x), with the [persistence format (now called P_BMM)](https://www.openehr.org/releases/BASE/latest/docs/bmm_persistence/bmm_persistence.html) being backwards-compatibly upgraded to version 2.3. The purpose of the upgrade was to improve the separation of class and type, and to greatly strengthen the semantics of generic types and classes.

[<img class="aligncenter size-full
wp-image-1227" src="https://wolandscat.files.wordpress.com/2018/07/bmm-awb.png" alt="" height="503" width="492">](http://wolandscat.net/2018/07/16/openehr-basic-meta-model-bmm-and-syntax-major-upgrade/bmm-awb/)

- thomas

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**Canonical:** https://discourse.openehr.org/t/openehr-basic-meta-model-bmm-and-syntax-major-upgrade/14389
**Original content:** https://discourse.openehr.org/t/openehr-basic-meta-model-bmm-and-syntax-major-upgrade/14389