# schema of .oet xml templates

**Category:** [Technical (archive)](https://discourse.openehr.org/c/technical-archive/156)
**Created:** 2019-09-19 09:04 UTC
**Views:** 3
**Replies:** 1
**URL:** https://discourse.openehr.org/t/schema-of-oet-xml-templates/14427

---

## Post #1 by @system

Hello,
In the international CKM in the template "Demo with hide\-on\-form\.oet" there is a tag named "activityDescription"\. I thought that only a fixed set of tags \(e\.g\. "Content", "Item", "Rule"\) are allowed in template definitions\. This tag looks like is a field name of the archetypes "openEHR\-EHR\-INSTRUCTION\.imaging\.v1"\. If arbitrary field names are allowed in template definitions, can there be at all a fixed template xml schema definition ?
Greetings
Georg

---

## Post #2 by @system

Hi Georg,

The .oet is a design-time format which underpins the Ocean Template Designer tool. You should always regard the .opt format that is generated as the AOM-compliant output, not the .oet which does some arbitrary stuff under the hood for internal reasons.

Ian

---


**Canonical:** https://discourse.openehr.org/t/schema-of-oet-xml-templates/14427
**Original content:** https://discourse.openehr.org/t/schema-of-oet-xml-templates/14427