(XForms)通过单击按钮自动选择节点集中继器中的节点

<xhtml:html xmlns:xhtml="http://www.w3.org/1999/xhtml"
             xmlns:xf="http://www.w3.org/2002/xforms">
  <xhtml:head>
    <xhtml:title>XForms NodeSet Example</xhtml:title>
    <xf:model>
      <xf:instance>
        <data>
          <items>
            <item>Item 1</item>
            <item>Item 2</item>
            <item>Item 3</item>
          </items>
        </data>
      </xf:instance>
      <xf:bind nodeset="instance('data')/items/item" id="item-bind"/>
    </xf:model>
  </xhtml:head>
  <xhtml:body>
    <xf:select ref="instance('data')/items/item">
      <xf:itemset nodeset="instance('data')/items/item"/>
    </xf:select>
    <xf:button>
      <xf:label>Select Item 2</xf:label>
      <xf:action ev:event="DOMActivate">
        <xf:setvalue ref="instance('data')/items/item[.='Item 2']" value="'selected'"/>
      </xf:action>
    </xf:button>
  </xhtml:body>
</xhtml:html>