The default implementation of OWLDataFactory.getRDFPlainLiteral creates a fresh object each time. It could just return a singleton. Similarly, OWLDataFactory.getOWLDatatype(OWL2Datatype) could return singletons.
Matthew fixed this in commit 96805192353586445f9770a683adf63ea7e02889
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Matthew fixed this in commit 96805192353586445f9770a683adf63ea7e02889