xquery 获取奇数/偶数节点结果

Moa*_*oak 2 xquery

<tr><td>garblegarble</td></tr>
<tr><td>goold</td></tr>
<tr><td>garblegfhjgarble</td></tr>
<tr><td>platinum</td></tr>
<tr><td>garblfgjfegarble</td></tr>
<tr><td>diamnodz</td></tr>
....
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我怎样才能只选择 TRs 2,4,6,8,10 ... 换句话说,偶数结果?

mor*_*rja 5

尝试:

//tr[position() mod 2 = 0]
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