... 扩入括号的表达式Parenthesized Expressions 上下文相关项目表达式Context Item Expression 函数调用Function Calls ...
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The dot (.) is now known as the context item expression, and might be a node or an atomic value, depending on the current item in the sequence being processed.
点号(.)在这里称为上下文项表达式，可以是节点或者原子值，视处理的序列中的当前项而定。
A context item, which is an XPath expression used to point to a node that will be the starting point for the column expressions, namely AccountingCustomerParty.
一个上下文项，它是一个XPath表达式，指向作为列表达式的起点的节点(即accountingcustomerparty)。
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