result = validateArtifactKeyInModel((PfConceptKey) pfKey, artifactKeySet, result);
} else if (pfKey instanceof PfReferenceKey) {
result = validateReferenceKeyInModel((PfReferenceKey) pfKey, referenceKeySet, result);
result = validateArtifactKeyInModel((PfConceptKey) pfKey, artifactKeySet, result);
} else if (pfKey instanceof PfReferenceKey) {
result = validateReferenceKeyInModel((PfReferenceKey) pfKey, referenceKeySet, result);