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https://issues.apache.org/jira/browse/JENA-1560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16508871#comment-16508871
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ASF GitHub Bot commented on JENA-1560:
--------------------------------------
Github user ajs6f commented on a diff in the pull request:
https://github.com/apache/jena/pull/432#discussion_r194564937
--- 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 --
Might want to put a link here to `calcInUsePrefixMapping` below just in
case someone wants to the precise meaning of "in use".
> Prefix utilities to prune prefixes to those needed by the data.
> ---------------------------------------------------------------
>
> Key: JENA-1560
> URL: https://issues.apache.org/jira/browse/JENA-1560
> Project: Apache Jena
> Issue Type: New Feature
> Components: Core
> Affects Versions: Jena 3.7.0
> Reporter: Andy Seaborne
> Assignee: Andy Seaborne
> Priority: Minor
>
> Sometimes, prefixes are no longer needed by the data. They still clutter-up
> output.
> In long lived (persistent), the effect can build up to the point where
> several 10s of prefixes are present but not used.
> Some utilities to prune the unused prefixes would be useful.
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