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RE: [xsl] Generic stylesheet to flatten XML hierarchy
Subject: RE: [xsl] Generic stylesheet to flatten XML hierarchy From: "Michael Kay" <mike@xxxxxxxxxxxx> Date: Sat, 5 Dec 2009 10:26:42 -0000 |
> But probably you know exactly what you're doing, there is a perfectly > reasonable algorithm for what you want, and I just haven't > understood. > I did once write a fairly generic stylesheet for a client that was inspired by the behaviour of the IDEs that show an XML document in "grid" layout. It ended up being an interesting set of heuristics that worked quite well for a reasonable range of input documents (and didn't fail on others). It's best seen as producing nested tables representing successive levels of hierarchy, with each table being formatted in one of a number of different styles based on pattern matching: a "named colummns" style where a sequence of elements each has N children with different names, a "list" style where elements have N children with the same name, a "mixed content" style where elements are displayed as text, and so on. The patterns have to be applied consistently across the whole document, so for example every order-item element is displayed in the same way regardless of its own individual structure. I can't remember why we decided to drive it from the actual data in instance documents rather than from the schema, but there was a good reason at the time. It was actually a meta-stylesheet, if I remember right: rather than doing the transformation, it generated the stylesheet to do the transformation. The idea of that was that once you had the logic to display one purchase order (say), you would use the same logic to display other purchase orders, so you got a consistent rendition for all of them; it also allowed hand-tweaking of the rules. Regards, Michael Kay http://www.saxonica.com/ http://twitter.com/michaelhkay
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