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这里是我的xml:Xpath的条件获取父
<people>
<person id="0001">
<firstname>Christopher</firstname>
<lastname>Shaw</lastname>
<birthdate>1975-02-23T21:24:46.000+02:00</birthdate>
<healthprofile>
<lastupdate>2014-09-30T10:38:07.000+02:00</lastupdate>
<weight>84</weight>
<height>2.13</height>
<bmi>18.51</bmi>
</healthprofile>
</person>
<person id="0002">
<firstname>Brian</firstname>
<lastname>Tooley</lastname>
<birthdate>1987-10-19T08:18:59.000+02:00</birthdate>
<healthprofile>
<lastupdate>2014-09-30T10:38:07.000+02:00</lastupdate>
<weight>98</weight>
<height>2.17</height>
<bmi>20.81</bmi>
</healthprofile>
</person>
</people>
我想用XPath是提取其重量等于80例如那些用户的名字做什么。我无法得到这个工作。