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diff --git a/unused/xml/sax/XMLFilter.java b/unused/xml/sax/XMLFilter.java
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+// XMLFilter.java - filter SAX2 events.
+// http://www.saxproject.org
+// Written by David Megginson
+// NO WARRANTY!  This class is in the Public Domain.
+// $Id: XMLFilter.java,v 1.6 2002/01/30 21:13:48 dbrownell Exp $
+
+package org.xml.sax;
+
+
+/**
+ * Interface for an XML filter.
+ *
+ * <blockquote>
+ * <em>This module, both source code and documentation, is in the
+ * Public Domain, and comes with <strong>NO WARRANTY</strong>.</em>
+ * See <a href='http://www.saxproject.org'>http://www.saxproject.org</a>
+ * for further information.
+ * </blockquote>
+ *
+ * <p>An XML filter is like an XML reader, except that it obtains its
+ * events from another XML reader rather than a primary source like
+ * an XML document or database.  Filters can modify a stream of
+ * events as they pass on to the final application.</p>
+ *
+ * <p>The XMLFilterImpl helper class provides a convenient base
+ * for creating SAX2 filters, by passing on all {@link org.xml.sax.EntityResolver
+ * EntityResolver}, {@link org.xml.sax.DTDHandler DTDHandler},
+ * {@link org.xml.sax.ContentHandler ContentHandler} and {@link org.xml.sax.ErrorHandler
+ * ErrorHandler} events automatically.</p>
+ *
+ * @since SAX 2.0
+ * @author David Megginson
+ * @version 2.0.1 (sax2r2)
+ * @see org.xml.sax.helpers.XMLFilterImpl
+ */
+public interface XMLFilter extends XMLReader
+{
+
+    /**
+     * Set the parent reader.
+     *
+     * <p>This method allows the application to link the filter to
+     * a parent reader (which may be another filter).  The argument
+     * may not be null.</p>
+     *
+     * @param parent The parent reader.
+     */
+    public abstract void setParent (XMLReader parent);
+
+
+    /**
+     * Get the parent reader.
+     *
+     * <p>This method allows the application to query the parent
+     * reader (which may be another filter).  It is generally a
+     * bad idea to perform any operations on the parent reader
+     * directly: they should all pass through this filter.</p>
+     *
+     * @return The parent filter, or null if none has been set.
+     */
+    public abstract XMLReader getParent ();
+
+}
+
+// end of XMLFilter.java