Observer::OnAssert(nsIRDFResource* aSource,
Observer::OnAssert(nsIRDFDataSource* aDataSource, nsIRDFResource* aSource,
Observer::OnAssert(nsIRDFResource* aSource,                   nsIRDFResource* aProperty,                   nsIRDFNode* aTarget){    return rdf_WriteOp("assert", aSource, aProperty, aTarget);}