只有在通用锁上执行同步或访问一个通用的可变变量时，才能创建跨线程的Happens - before排序。
Happens-before orderings across threads are only created by synchronizing on a common lock or accessing a common volatile variable.
毕竟XSLT缺少对很多算法来说极其重要的特性，其中包括循环和可变的变量。
After all, XSLT is missing some features that are important to a lot of algorithms, including loops and mutable variables.
这与大多数语言不一样—变量的定义通常意味着值是可变的。
This is unlike most languages - the very definition of variable tends to imply that the value is variable.
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