I appreciate the wisdom of separating the existence of a key from the
conformance of the values of that key.
I wonder though if there is a way to specify co-constraints; a situation
where the conformance of the value of one key depends on the existence
of and perhaps the value of another key.
Say for example, I want to specify a ::content-type key and a ::body
key. If the ::content-type key exists and has a value of "image/png" I
want to make sure the ::body key also exists and satisfies my image?
predicate.
It looks like multi-specs get me to the neighborhood of a solution here
but I'm not sure they quite cover it.
Thanks,
StanD.
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