| http://www.w3.org/ns/prov#value | - A. associating a tag item with each memory word only when the memory word is designated as a stack item, the tag item having a value indicating whether the associated stack item is a reference or a primitive value; and B. determining from the value of a tag item associated with the selected stack item whether the data contained within the selected stack item is a reference or a primitive value. 30
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