Github user afs commented on a diff in the pull request:
https://github.com/apache/jena/pull/432#discussion_r194707130
--- Diff:
jena-core/src/main/java/org/apache/jena/util/PrefixMappingUtils.java ---
@@ -0,0 +1,362 @@
+/*
+ * 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.jena.util;
+
+import java.util.* ;
+import java.util.function.Consumer ;
+import java.util.stream.Collectors ;
+
+import org.apache.jena.atlas.lib.SetUtils ;
+import org.apache.jena.atlas.lib.Trie ;
+import org.apache.jena.graph.Graph ;
+import org.apache.jena.graph.Node ;
+import org.apache.jena.graph.Triple ;
+import org.apache.jena.graph.impl.WrappedGraph;
+import org.apache.jena.rdf.model.Model ;
+import org.apache.jena.shared.PrefixMapping ;
+import org.apache.jena.shared.impl.PrefixMappingImpl ;
+
+public class PrefixMappingUtils {
+ /**
+ * Return a read-only graph that has the same data (RDF triples) as
the one given, but has a
+ * prefix mapping that only includes "in use " prefixes.
--- End diff --
Done
---
