| http://www.w3.org/ns/prov#value | - Nullable integers are specified with the int? type.Also:The int type is actually aliased to the System.Int32 type, and using System.Int32? would work as well.Tip:When you use a type such as int?, you have access to extra properties such as HasValue and Value.The HasValue property returns a bool that indicates whether the nullable instance contains a set value.If the type is null,it does not ha
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