A process engineering task requires good understanding of RUP taxonomy (meta-model) and availability of a consistent extension mechanism.
一个过程工程任务需要对RUP分类法(元模型)具备很好的理解，以及具备相互兼容的扩展机制。
Can't check the availability of stylesheet functions, but you can check for vendor-written extension functions built into the processor?
不能检查样式表函数的可用性，但是可以检查处理程序中内置的厂商编写的扩展函数。
Use of an extension function, guarded by XSL: choose testing for availability of the function.
使用扩展函数，用xsl： choose测试保证函数的可用性。
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