XML节点到关系列的映射隐含在xmltable函数中。

The mapping of XML nodes to relational columns is implicit in the XMLTABLE function.

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(注意显式命名空间tk：在这里是必需的，因为画布部件定义了自己的bind函数是隐含继承的)。

Note that the explicit namespace Tk: : is necessary here, since the Canvas widget defines its own bind function that hides the inherited one.

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这些函数要么在返回值和参数上缺乏一致性，要么隐含着所谓的“截断误差”(truncation errors)错误，要么无法提供足够强大的功能。

The current functions have inconsistent return values and parameters, truncation errors, and lack advanced functionality.

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