Github user stain commented on a diff in the pull request:
https://github.com/apache/incubator-commonsrdf/pull/24#discussion_r81675157
--- Diff:
rdf4j/src/main/java/org/apache/commons/rdf/rdf4j/RDF4JGraphLike.java ---
@@ -0,0 +1,63 @@
+/**
+ * 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;
+
+import java.util.Optional;
+
+import org.apache.commons.rdf.api.BlankNodeOrIRI;
+import org.apache.commons.rdf.api.GraphLike;
+import org.apache.commons.rdf.api.IRI;
+import org.apache.commons.rdf.api.RDFTerm;
+import org.apache.commons.rdf.api.TripleLike;
+import org.eclipse.rdf4j.model.Model;
+import org.eclipse.rdf4j.repository.Repository;
+
+/**
+ * Marker interface for RDF4J implementations of GraphLike.
+ *
+ * @see RDF4JGraph
+ *
+ */
+public interface RDF4JGraphLike<T extends TripleLike<BlankNodeOrIRI, IRI,
RDFTerm>>
--- End diff --
`Triple` does inherit from `TripleLike<BlankNodeOrIRI, IRI, RDFTerm>` -
that's the whole point :)
The only thing `RDFTripleLike` adds compared to `Triple` is the
`asStatement()` method - which is probably useful for integration purposes.
But I think we could add a `GeneralizedTriple` interface to avoid exposure
of `TripleLike` generics - but perhaps only to the jena module for now.
JSONLD-Java should in theory also support that (as JSON-LD does) - at least
having blank nodes for properties.
But I think that it can be hard - at least at this point - to say what is
the "common generalized triple" at the API module.
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