Additional syntax to select a particular XML document, and to add selection criteria to the nodes returned from an xpath.

选择特定XML文档、为XPath返回的节点增加选择条件的附加语法。

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Knowledge of the global expression profile not only contributes to our understanding of pathogenesis, but also provides additional criteria for selection of vaccine candidates.

关于基因表达谱的知识不仅有助于我们理解发病机理，而且可以为筛选疫苗候选分子提供额外的标准。

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