I don't know if this is exactly what you were looking for, but it did work for me in isolating event frame data in the PI Web API searching by a specific event frame template:
I am running PI Web API 2016.
That would work well if I was looking for a particular template, but in this case I want to grab all event frame templates in the asset database.
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Quoting the PI Web API development group leader:
... Currently, you must examine the "InstanceType" of the response to determine if a Template is for an EventFrame or not. We are considering doing this on the server side in a future release.
Here is the source thread:
Edit: copying Mike Sloves
Thank you. I would find this functionality helpful in a future release.