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。
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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