需要使用XSLT将某些段落标记在一个标记中，并保留在另一个标记中

<!-- 输入XML文档 -->
<root>
  <paragraph>段落1</paragraph>
  <paragraph>段落2</paragraph>
  <paragraph>段落3</paragraph>
</root>

<!-- XSLT转换规则 -->
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:template match="/">
    <output>
      <marked>
        <xsl:apply-templates select="root/paragraph"/>
      </marked>
      <reserved>
        <xsl:apply-templates select="root/paragraph"/>
      </reserved>
    </output>
  </xsl:template>
  
  <xsl:template match="paragraph">
    <xsl:element name="p">
      <xsl:attribute name="class">marked</xsl:attribute>
      <xsl:value-of select="."/>
    </xsl:element>
  </xsl:template>
</xsl:stylesheet>

<output>
  <marked>
    <p class="marked">段落1</p>
    <p class="marked">段落2</p>
    <p class="marked">段落3</p>
  </marked>
  <reserved>
    <p class="marked">段落1</p>
    <p class="marked">段落2</p>
    <p class="marked">段落3</p>
  </reserved>
</output>