# SM

**URL:** https://discourse.openehr.org/c/specifications/service-model/82.md

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## [About the SM category](https://discourse.openehr.org/t/about-the-sm-category/2383)

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**Author:** [@thomas.beale](https://discourse.openehr.org/u/thomas.beale)\
**Replies:** 0

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For discussions of the openEHR Service Model (SM).

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## [Compositions list from OpenEHR REST API](https://discourse.openehr.org/t/compositions-list-from-openehr-rest-api/2467)

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**Author:** [@surfer](https://discourse.openehr.org/u/surfer)\
**Replies:** 2\
**Last updated:** [25 March 2022 11:40 UTC](https://discourse.openehr.org/t/compositions-list-from-openehr-rest-api/2467 "2022-03-25T11:40:23Z")

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I have a probably naive question. Is there a way through the openEHR REST API to get the list of compositions for a selected EHR? I mean without using a query. In fact, I managed to do it only with the help of an AQL qu…

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## [Controlling CDR content creation](https://discourse.openehr.org/t/controlling-cdr-content-creation/2382)

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**Author:** [@thomas.beale](https://discourse.openehr.org/u/thomas.beale)\
**Replies:** 0\
**Last updated:** [21 February 2022 17:36 UTC](https://discourse.openehr.org/t/controlling-cdr-content-creation/2382 "2022-02-21T17:36:11Z")

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From the SEC call today, a discussion on a very interesting topic: how would a CDR limit creation of a particular kind of (say) persistent Composition (e.g. Medications list) to one effective instance in the system? Wik…