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diff --git a/libjava/classpath/gnu/xml/dom/ImplementationSource.java b/libjava/classpath/gnu/xml/dom/ImplementationSource.java
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+++ b/libjava/classpath/gnu/xml/dom/ImplementationSource.java
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+/* ImplementationSource.java --
+   Copyright (C) 2004 Free Software Foundation, Inc..
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+package gnu.xml.dom;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Iterator;
+import java.util.List;
+
+import org.w3c.dom.DOMImplementation;
+import org.w3c.dom.DOMImplementationList;
+import org.w3c.dom.DOMImplementationSource;
+
+/**
+ * Implementation source for GNU JAXP.
+ *
+ * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
+ */
+public class ImplementationSource
+  implements DOMImplementationSource
+{
+
+  private static final String DIGITS = "1234567890";
+
+  /*
+   * GNU DOM implementations.
+   */
+  private static final DOMImplementation[] implementations;
+
+  static
+  {
+    List acc = new ArrayList();
+    acc.add(new gnu.xml.dom.DomImpl());
+    try
+      {
+        Class t = Class.forName("gnu.xml.libxmlj.dom.GnomeDocumentBuilder");
+        acc.add(t.newInstance());
+      }
+    catch (Exception e)
+      {
+        // libxmlj not available
+      }
+    catch (UnsatisfiedLinkError e)
+      {
+        // libxmlj not available
+      }
+    implementations = new DOMImplementation[acc.size()];
+    acc.toArray(implementations);
+  }
+
+  public DOMImplementation getDOMImplementation(String features)
+  {
+    List available = getImplementations(features);
+    if (available.isEmpty())
+      {
+        return null;
+      }
+    return (DOMImplementation) available.get(0);
+  }
+
+  public DOMImplementationList getDOMImplementationList(String features)
+  {
+    List available = getImplementations(features);
+    return new ImplementationList(available);
+  }
+
+  /**
+   * Returns a list of the implementations that support the specified
+   * features.
+   */
+  private final List getImplementations(String features)
+  {
+    List available = new ArrayList(Arrays.asList(implementations));
+    for (Iterator i = parseFeatures(features).iterator(); i.hasNext(); )
+      {
+        String feature = (String) i.next();
+        String version = null;
+        int si = feature.indexOf(' ');
+        if (si != -1)
+          {
+            version = feature.substring(si + 1);
+            feature = feature.substring(0, si);
+          }
+        for (Iterator j = available.iterator(); j.hasNext(); )
+          {
+            DOMImplementation impl = (DOMImplementation) j.next();
+            if (!impl.hasFeature(feature, version))
+              {
+                j.remove();
+              }
+          }
+      }
+    return available;
+  }
+
+  /**
+   * Parses the feature list into feature tokens.
+   */
+  final List parseFeatures(String features)
+  {
+    List list = new ArrayList();
+    int pos = 0, start = 0;
+    int len = features.length();
+    for (; pos < len; pos++)
+      {
+        char c = features.charAt(pos);
+        if (c == ' ')
+          {
+            if (pos + 1 < len &&
+                DIGITS.indexOf(features.charAt(pos + 1)) == -1)
+              {
+                list.add(getFeature(features, start, pos));
+                start = pos + 1;
+              }
+          }
+      }
+    if (pos > start)
+      {
+        list.add(getFeature(features, start, len));
+      }
+    return list;
+  }
+
+  final String getFeature(String features, int start, int end)
+  {
+    if (features.length() > 0 && features.charAt(start) == '+')
+      {
+        return features.substring(start + 1, end);
+      }
+    return features.substring(start, end);
+  }
+
+}