当然，这不能解决一个最终问题：最前面的非终结符表达式没有任何地方可以返回，所以您应该处理它生成的值。
Of course, this doesn't solve one last problem: the starting non-terminal expression has nowhere to return to, so you will need to do something with the values it produces.
搜索主体、属性、值或注释中的文本，但没有正则表达式。
Search on text in bodies, attributes, values, or comments but no regular expressions.
如果没有XPath表达式的值是true，那么选择默认的类型定义(xs：string)。
If none of the XPath expressions evaluate to true, the default type definition (xs: string) is selected.
regmatch(re,text)函数将比较正则表达式和文本，如果没有匹配的话就生成Null 值，否则生成一个由成对整数组成的数组（双元素数组）。
The regmatch(re, text) function compares the regular expression to the text, yielding either Null for no matches or an array of pairs of integers (a two-element array).
所以，如果你需要用数学式子计算一个值，那就只有用表达式返回这个值，没有其他语法结构可用，因为否则就无法处理这个值。
And so while you needed expressions for math to work, there was no point in making anything else return a value, because there could not be anything waiting for it.
我之所以没有把这些放在一起，是因为接下来你们将会得到，两个竖着的表达式，这个是绝对值，而这个是行列式。
OK, so I didn't put it all together because then you would have two sets of vertical bars. See, this is a vertical bar for absolute value. This is vertical bar for determinant.
可以在没有脚本的JSP页面中使用set.tag文件（参见清单4）来设置 #{...}表达式的值。
The set.tag file (see Listing 4) can be used in a scriptless JSP page to set the value of a #{...} expression.
变量的值是一个对象，可以是任何表达式结果类型，也可以这里没有说明的附加类型。
The value of a variable is an object, which can be of any of the types that are possible for the value of an expression, and may also be of additional types not specified here.
变量的值是一个对象，可以是任何表达式结果类型，也可以这里没有说明的附加类型。
The value of a variable is an object, which can be of any of the types that are possible for the value of an expression, and may also be of additional types not specified here.
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