这项技术特别有助于发现使用浮点值、转换率，以及与数据类型相关长度的问题。

This technique can especially help in finding problems with floating-point values, conversion ratios, and lengths associated with data types.

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Attribute确认器会证实单个的属性会设置为一个有效的值，长度，格式，或者数据类型。

Attribute validators verify that a single attribute is set to a valid value, length, format, or data type.

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XPath 1.0到XPath 2.0最引人注意的一个改变是引入了更加丰富的类型系统：每个值现在都是一个序列，一个单一的值将被视为长度为1的序列。

The most notable change from XPath 1.0 to XPath 2.0 is the introduction of a much richer type system: Every value is now a sequence, with a single value being treated as a sequence of length 1.

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