These transformationsgroup a set of mappings based on a given XPath expression condition.
这些转换根据给定的 XPath 表达式条件对映射进行分组。
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Originally, the JAXP expert group sought to provide a simple transform class with a few methods to allow specification of a style sheet and subsequent document transformations.
These transformations are made up of renormalization group. Then the fixed point of transformation can be found, among which those unstable ones are critical points of phase transition.