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我有這樣的XML:尋找兄弟姐妹的XPath
<incollection mdate="2017-05-16" key="reference/algo/NaFGP08"
publtype="encyclopedia entry">
<author>Joong Chae Na</author>
<author>Paolo Ferragina</author>
<author>Raffaele Giancarlo</author>
<author>Kunsoo Park</author>
<title>Two-Dimensional Pattern Indexing.</title>
<year>2008</year>
<booktitle>Encyclopedia of Algorithms</booktitle>
<ee>https://doi.org/10.1007/978-0-387-30162-4_442</ee>
<crossref>reference/algo/2008</crossref>
<url>db/reference/algo/algo2008.html#NaFGP08</url>
</incollection>
如何選擇保羅Ferragina的使用XPath所有的合作者?