# \#grammars

**URL:** https://discourse.openehr.org/tag/grammars/84.md

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## [Format of AT codes](https://discourse.openehr.org/t/format-of-at-codes/3905)

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**Author:** [@richard.kavanagh](https://discourse.openehr.org/u/richard.kavanagh)\
**Replies:** 2\
**Last updated:** [24 April 2023 21:46 UTC](https://discourse.openehr.org/t/format-of-at-codes/3905 "2023-04-24T21:46:42Z")

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Apologies if I have missed it in the documentation, but is there a stated rule for the format of AT codes? I have looked but don’t see one, the class model seems to just say they are a string. Sidestepping, specialisat…

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## [ADL1.4 Grammars - possible defect](https://discourse.openehr.org/t/adl1-4-grammars-possible-defect/3845)

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**Author:** [@richard.kavanagh](https://discourse.openehr.org/u/richard.kavanagh)\
**Replies:** 2\
**Last updated:** [23 April 2023 12:10 UTC](https://discourse.openehr.org/t/adl1-4-grammars-possible-defect/3845 "2023-04-23T12:10:21Z")

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More questions regarding the grammar files for ADL1.4 (and possibly ADL2.0) Looking at the ADL 1.4 documentation the high level structure is shown to be as below My questions revolve around the ‘revision\_history’ se…

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## [openEHR grammar generalities](https://discourse.openehr.org/t/openehr-grammar-generalities/1875)

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**Author:** [@thomas.beale](https://discourse.openehr.org/u/thomas.beale)\
**Replies:** 0\
**Last updated:** [20 September 2021 21:18 UTC](https://discourse.openehr.org/t/openehr-grammar-generalities/1875 "2021-09-20T21:18:39Z")

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Following @pablo 's recent post on Terminology Ids, I was having a look at some really basic things, including definitions for Integer, which appear in versions as well as numbers and parts of Reals/floats etc. We curre…