Attribute validators verify that a single attribute is set to a valid value, length, format, or data type.
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。
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.
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。
Type into the member function Main a few lines of code to create an instance of Quad and then assert that when the object Area method is given a length of 3 and width of 2, it returns the value 6.
在主函数中输入下列几行代码，创建Quad实例，并通过Assert断言，当长宽各为3和2时，返回的结果应该是6。
The length is specified in two parts, the length's value and the length's unit type.
长度指定为两部分，长度值和长度单位类型。
Critical slope gradient or slope length is not a constant value, which varies in some ranges and depends on the factors of rainfall, slope type.
临界坡度、临界坡长都不是一个确定的值，但在一定范围内变化，变化范围由降雨、坡面地形等因素决定。
This method make use of given error to control the section length and to removal superfluous type value points. The method can reduce working code length to a minimum without overgauge.
在给定的公差下，根据刀位点轨迹的程序段分割误差确定程序段的大小，剔除多余的型值点，保证加工指令的长度不超出CNC系统提供给用户的内存空间。
This method make use of given error to control the section length and to removal superfluous type value points. The method can reduce working code length to a minimum without overgauge.
在给定的公差下，根据刀位点轨迹的程序段分割误差确定程序段的大小，剔除多余的型值点，保证加工指令的长度不超出CNC系统提供给用户的内存空间。
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