| http://www.w3.org/ns/prov#value | - This follows on from the languages on which PHP is syntactically based, such as C and C++, and most code that I have seen (and written) continues this convention.The thing is though, true and false are *not* constants: they are keywords.As a different way of explaining that, consider how one would write the define statement for TRUE and FALSE, without being recursive.
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