Evaluate Math Expressions 评估的数学表达式
The XSLT language gives the processor great freedom to evaluate expressions in any order it chooses, because of the absence of side effects.
XSLT语言给了处理器很大的自由，让它可以按其选择的顺序对表达式求值，因为它没有副作用。
Once you've created your factory, you need to move from it to an object that can actually evaluate expressions and interact with the XPath environment.
创建工厂之后，还需要从工厂转移到能够真正计算表达式并与XPath环境交互的对象。
This article will walk you through the highlights of W3Eval's functionality; you'll be able to look at some of the code it USES to evaluate expressions.
本文将让您从头至尾认识W3Eval功能性的要点；您将看到一些用于表达式求值的代码。
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