| http://www.w3.org/ns/prov#value | - in this document, a generator is an object similar to an array that generates its elements on demand. generators can be used as iterators in perl's list control structures such as for/foreach and while . generators, like programmers, are lazy. unless they have to, they will not calculate or store anything. this laziness allows infinite generators to be created. you can choose to explicitly cache a
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