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。
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。
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。
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