Is the "XPath-like syntax" for custom fields documented?
Nobody’s responded to my previous related question.
That’s fine and I’m capable of figuring this out myself, except there doesn’t seem to be any actual explanation for how/why the syntax is XPath-like versus just XPath. I’m assuming it’s some kind of sub-set, but we’re never told what that is, so I can’t even determine whether I’m wasting my time because what I’m trying to do there is just impossible or what.
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