Higher-Order Relationships
It is not unusual for someone who is building a model in RDF for the first time to feel a bit limited by the simple subject/predicate/object form of the RDF triple. They don’t want to just say that Shakespeare wrote Hamlet, but they want to qualify this statement and say that Shakespeare wrote Hamlet in 1604 or that Wikipedia states that Shakespeare wrote Hamlet in 1604. In general, these are cases in which it is, or at least seems, desirable to make a statement about another statement. This process is called reification. Reification is not a problem specific to Semantic Web modeling; the same issue arises in other data modeling contexts like relational databases and object systems. In fact, one approach to reification ...
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