diff --git a/src/main/org/apache/tools/ant/taskdefs/AntStructure.java b/src/main/org/apache/tools/ant/taskdefs/AntStructure.java
index 013e051dc..a387389a1 100644
--- a/src/main/org/apache/tools/ant/taskdefs/AntStructure.java
+++ b/src/main/org/apache/tools/ant/taskdefs/AntStructure.java
@@ -178,6 +178,16 @@ public class AntStructure extends Task {
         StringBuffer sb = new StringBuffer("<!ELEMENT ");
         sb.append(name).append(" ");
 
+        if (org.apache.tools.ant.types.Reference.class.equals(element)) {
+            sb.append("EMPTY>").append(lSep);
+            sb.append("<!ATTLIST ").append(name);
+            sb.append(lSep).append("          id ID #IMPLIED");
+            sb.append(lSep).append("          refid IDREF #IMPLIED");
+            sb.append(">").append(lSep);
+            out.println(sb);
+            return;
+        }
+
         Vector v = new Vector();
         if (ih.supportsCharacters()) {
             v.addElement("#PCDATA");
@@ -218,6 +228,8 @@ public class AntStructure extends Task {
             if (type.equals(java.lang.Boolean.class) || 
                 type.equals(java.lang.Boolean.TYPE)) {
                 sb.append("%boolean; ");
+            } else if (org.apache.tools.ant.types.Reference.class.isAssignableFrom(type)) { 
+                sb.append("IDREF ");
             } else if (org.apache.tools.ant.EnumeratedAttribute.class.isAssignableFrom(type)) {
                 try {
                     EnumeratedAttribute ea = 
diff --git a/src/main/org/apache/tools/ant/types/FileSet.java b/src/main/org/apache/tools/ant/types/FileSet.java
index 16758d149..ba3bfe564 100644
--- a/src/main/org/apache/tools/ant/types/FileSet.java
+++ b/src/main/org/apache/tools/ant/types/FileSet.java
@@ -57,7 +57,9 @@ package org.apache.tools.ant.types;
 import org.apache.tools.ant.BuildException;
 import org.apache.tools.ant.DirectoryScanner;
 import org.apache.tools.ant.Project;
+
 import java.io.File;
+import java.util.Vector;
 
 /**
  * Moved out of MatchingTask to make it a standalone object that could
@@ -71,7 +73,8 @@ import java.io.File;
  */
 public class FileSet {
     
-    private PatternSet patterns = new PatternSet();
+    private PatternSet defaultPatterns = new PatternSet();
+    private Vector additionalPatterns = new Vector();
 
     private File dir;
     private boolean useDefaultExcludes = true;
@@ -95,21 +98,29 @@ public class FileSet {
     }
 
     public PatternSet createPatternSet() {
+        PatternSet patterns = new PatternSet();
+        additionalPatterns.addElement(patterns);
         return patterns;
     }
 
+    public Reference createPatternSetRef() {
+        Reference r = new Reference();
+        additionalPatterns.addElement(r);
+        return r;
+    }
+
     /**
      * add a name entry on the include list
      */
     public PatternSet.NameEntry createInclude() {
-        return patterns.createInclude();
+        return defaultPatterns.createInclude();
     }
     
     /**
      * add a name entry on the exclude list
      */
     public PatternSet.NameEntry createExclude() {
-        return patterns.createExclude();
+        return defaultPatterns.createExclude();
     }
 
     /**
@@ -119,7 +130,7 @@ public class FileSet {
      * @param includes the string containing the include patterns
      */
     public void setIncludes(String includes) {
-        patterns.setIncludes(includes);
+        defaultPatterns.setIncludes(includes);
     }
 
     /**
@@ -129,7 +140,7 @@ public class FileSet {
      * @param excludes the string containing the exclude patterns
      */
     public void setExcludes(String excludes) {
-        patterns.setExcludes(excludes);
+        defaultPatterns.setExcludes(excludes);
     }
 
     /**
@@ -139,7 +150,7 @@ public class FileSet {
      * the include patterns from.  
      */
      public void setIncludesfile(File incl) throws BuildException {
-         patterns.setIncludesfile(incl);
+         defaultPatterns.setIncludesfile(incl);
      }
 
     /**
@@ -149,7 +160,7 @@ public class FileSet {
      * the include patterns from.  
      */
      public void setExcludesfile(File excl) throws BuildException {
-         patterns.setExcludesfile(excl);
+         defaultPatterns.setExcludesfile(excl);
      }
 
     /**
@@ -169,8 +180,25 @@ public class FileSet {
     public DirectoryScanner getDirectoryScanner(Project p) {
         DirectoryScanner ds = new DirectoryScanner();
         ds.setBasedir(dir);
-        ds.setIncludes(patterns.getIncludePatterns(p));
-        ds.setExcludes(patterns.getExcludePatterns(p));
+
+        for (int i=0; i<additionalPatterns.size(); i++) {
+            Object o = additionalPatterns.elementAt(i);
+            if (o instanceof PatternSet) {
+                defaultPatterns.append((PatternSet) o);
+            } else {
+                Reference r = (Reference) o;
+                o = r.getReferencedObject(p);
+                if (o instanceof PatternSet) {
+                    defaultPatterns.append((PatternSet) o);
+                } else {
+                    String msg = r.getRefId()+" doesn\'t denote a patternset";
+                    throw new BuildException(msg);
+                }
+            }
+        }
+        
+        ds.setIncludes(defaultPatterns.getIncludePatterns(p));
+        ds.setExcludes(defaultPatterns.getExcludePatterns(p));
         if (useDefaultExcludes) ds.addDefaultExcludes();
         ds.scan();
         return ds;
diff --git a/src/main/org/apache/tools/ant/types/Reference.java b/src/main/org/apache/tools/ant/types/Reference.java
new file mode 100644
index 000000000..1c3f87b06
--- /dev/null
+++ b/src/main/org/apache/tools/ant/types/Reference.java
@@ -0,0 +1,99 @@
+/*
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2000 The Apache Software Foundation.  All rights 
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. The end-user documentation included with the redistribution, if
+ *    any, must include the following acknowlegement:  
+ *       "This product includes software developed by the 
+ *        Apache Software Foundation (http://www.apache.org/)."
+ *    Alternately, this acknowlegement may appear in the software itself,
+ *    if and wherever such third-party acknowlegements normally appear.
+ *
+ * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
+ *    Foundation" must not be used to endorse or promote products derived
+ *    from this software without prior written permission. For written 
+ *    permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache"
+ *    nor may "Apache" appear in their names without prior written
+ *    permission of the Apache Group.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ */
+
+package org.apache.tools.ant.types;
+
+import org.apache.tools.ant.Project;
+import org.apache.tools.ant.BuildException;
+
+/**
+ * Named collection of include/exclude tags.
+ *
+ * <p>Class to hold a reference to another object in the project.
+ *
+ * @author <a href="mailto:stefan.bodewig@megabit.net">Stefan Bodewig</a> 
+ */
+public class Reference {
+
+    private String refid;
+
+    public Reference() {
+        super();
+    }
+
+    public Reference(String id) {
+        this();
+        setRefId(id);
+    }
+
+    public void setRefId(String id) {
+        refid = id;
+    }
+
+    public String getRefId() {
+        return refid;
+    }
+
+    public Object getReferencedObject(Project project) throws BuildException {
+        if (refid == null) {
+            throw new BuildException("No reference specified");
+        }
+        
+        Object o = project.getReferences().get(refid);
+        if (o == null) {
+            throw new BuildException("Refernce "+refid+" not found.");
+        }
+        return o;
+    }
+}