| http://www.w3.org/ns/prov#value | - for static/member variables, if you are going to initialise them to something, then zero is a convenient value because (a) it is generally a suitable value to mean not set to anything else special, and is the value you would have picked anyway in some cases such as counters; and (b) internally, it is likely that zero can be used for "special values, notably to represent null in the case of an obje
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