While XSLT 1.0 and XPath 1.0 are quite powerful languages for transforming and querying XML respectively, there are some tasks that are difficult or impossible to achieve using them. For example, you’ve seen the hoops that you have to jump through to group elements using XSLT, and while it’s possible to write recursive templates to calculate the minimum and maximum values from a set of nodes, it’s very tedious to use them compared to using a function to do the same thing.
KeywordsExtension Attribute Extension Function Extension Element Method Attribute Working Draft
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