Subject: Re: XSL and entities From: James Clark <jjc@xxxxxxxxxx> Date: Sun, 20 Sep 1998 10:50:16 +0700 |
G. Ken Holman wrote: > If you are willing to express the "concepts" (dare I say semantics?) of foo > in XML, say FooML, and then write a translator from FooML to foo, you would > be able to then use XSL to do your arbitrary conversions from XML->foo as > follows: > > XML ---XSL--> FooML ---FooXlate--> foo > > This does, however, require the FooXlate program to be written, say on top > of SAX, but written *only once* for all the semantics of whatever makes > sense for Foo and *without regard* for the transformations necessary from > other markup languages. This is the right approach. To make this work smoothly - give FooML a namespace URI - specify that with the result-ns attribute - use result elements from that namespace (typically by specifying an xmlns attribute) - configure your XSL processor with an association between the namespace URI with the FooXlate program Then you can translate using XSL to foo and the XSL processor can automatically give you foo instead of FooML. Note that FooML doesn't have to be an elaborate expression of the semantics of Foo in XML (although there advantages if you can do that). It can be braindead simple. For example, for LaTeX a DTD like this would be probably enough: <!DOCTYPE LaTeX [ <!ELEMENT LaTeX (#PCDATA|markup)*> <!ELEMENT markup (#PCDATA)> ]> The LaTeXXlate program would pass characters within a "markup" element through unchanged, but would transform characters outside a "markup" element so that when formatted with LaTeX they would print a representation of that character. For example, outside a "markup" element, { and } would be output as \{ and \}, but inside they would be output unchanged as { and }. There are several ways this can be generalized... James XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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