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


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