| http://www.w3.org/ns/prov#value | - Briefly, references are rather like pointers that know what they point to. (Objects are also a kind of reference, but we will not be needing them right away--if ever.) This means that when you have something which looks to you like an access to a two-or-more-dimensional array and/or hash, what is really going on is that the base type is merely a one-dimensional entity that contains references to the n
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