| http://www.w3.org/ns/prov#value | - That is to say, regardless of how we view our friend null, and whether one chooses to build collections that can contain null and thus must implement a distinct contains(key) method, or whether one decides that no key's in your collection(s) can be associated with null values and so a null return for some get(key) method is sufficient ... is, to me, mostly a question of what conventions a library
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