A topic expression is defined in terms of expression type, fully qualified topic name, and prefix mapping.

主题表达式包含表达式类型、完全限定主题名称和前缀映射。

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The XPath expression used to define the XML part to search in does not contain the namespace prefix — the fully qualified element name (QName), in other words.

用来定义要搜索的XML部分的XPath表达式没有包含名称空间前缀——换句话说，没有包含完全限定的元素名称(QName)。

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