<persons>
<person>battie</person>
<person>yao</person>
<person>tmac</person>
</persons>要选出person元素为yao的元素, 怎么写?
<person>battie</person>
<person>yao</person>
<person>tmac</person>
</persons>要选出person元素为yao的元素, 怎么写?
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it doesn't work. instead /persons/person[.='yao'] seems to work well