定义查询表达式树中的文字节点。

Defines the literal node in a query expression tree.

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它会传回所有串连的项目文字节点。

It returns all the concatenated element text nodes.

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二进位格式仅支援一个当做属性值的文字节点，因此会缓冲处理写入至其中的值来发出单一节点，如下列范例程序码所示。

The binary format only supports one text node as the attribute value and therefore buffers the values written to it to emit a single node, as shown in the following sample code.

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