xalansamples/src/main/java/samples/extensions/1-redir.xsl

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    version="1.0"
    xmlns:redirect="http://xml.apache.org/xalan/redirect"
    extension-element-prefixes="redirect">

  <!--
   * 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.
  -->

  <xsl:template match="/">
    <standard-out>
      Standard output:
      <xsl:apply-templates/>
    </standard-out>
  </xsl:template>

  <!-- not redirected -->
  <xsl:template match="doc/main">
    <main>
    -- look in <xsl:value-of select="/doc/foo/@file"/> for the redirected output --
      <xsl:apply-templates/>
    </main>
  </xsl:template>
  
  <!-- redirected -->
  <xsl:template match="doc/foo">
    <!-- get redirect file name from XML input -->
    <redirect:write select="@file">
      <foo-out>
        <xsl:apply-templates/>
      </foo-out>
    </redirect:write>
  </xsl:template>
  
<!-- redirected (from the xsl:apply-templates above. I.e., bar is in /doc/foo -->  
  <xsl:template match="bar">
    <foobar-out>
      <xsl:apply-templates/>
    </foobar-out>
  </xsl:template>
  
</xsl:stylesheet>