| http://www.w3.org/ns/prov#value | - for the attribute ???price???. type: integercheck: function(value) { if (value < 0) return false; else returntrue; } } These define two things: price has to be an integer; andprice has to be larger than 0 As is evident from the above, there are two kinds of things to be checked, a declarative description such as the type and a logical description such as the check.
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