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1. Triples can go away (subgraph lemma)
2. Nodes can lose their labels (instance lemma)
2. Nodes can get new (otherwise-unused) labels (Skolemization lemma)
And this should not allow additional inference.
Approach: use lots of owl:FunctionalProperties, and define a graph which is not owl-satisfiable as entailing everything. In practice that means that if you don't trust your well-formedness, you should query for an error first.
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