Github user ansell commented on a diff in the pull request:
https://github.com/apache/incubator-commonsrdf/pull/24#discussion_r82317429
--- Diff: rdf4j/src/main/java/org/apache/commons/rdf/rdf4j/RDF4JIRI.java ---
@@ -0,0 +1,35 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.commons.rdf.rdf4j;
+
+/**
+ * Marker interface for RDF4J implementations of IRI.
+ *
+ */
+public interface RDF4JIRI
+ extends RDF4JTerm<org.eclipse.rdf4j.model.IRI>,
org.apache.commons.rdf.api.IRI {
+
+ /**
+ * Return the corresponding RDF4J {@link org.eclipse.rdf4j.model.IRI}.
+ *
+ * @return The corresponding RDF4J IRI
+ */
+ public org.eclipse.rdf4j.model.IRI asValue();
--- End diff --
See my comment about removing the generics parameter from RDF4JTerm so it
would no longer be a null override, but would be using typical Java return
value extension to redefine the return value. That would simplify understanding
here IMO, with "asValue" returning "IRI", but having no reason to have to pass
that on to the super interface, as the heirarchy already matches the Value->IRI
heirarchy from RDF4J so should work smoothly.
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