"state" and "protocol" structures are mandatory, when defined?

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"state" and "protocol" structures are mandatory, when defined?

Hi all, I have a doubt in interpretating the archetype definition when there are "state" or "protocol" structure. For example, looking at "Blood Pressure" in http://openehr.org/knowledge/, I'm wondering if "protocol" structure is mandatory, as it seems looking at the archetype. If I don't know