schema of .oet xml templates

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

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