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XSLT Preprocessing


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Good day, My XSLT transforms XLM pages into HTML pages. Now I am stuck with a problem, that seems not trivial to me. I would appreciate a pointer into the right direction. I want to reduce the number of lines I have to write in my original XML files. What I want, is something like a XSLT preprocessor, translating some XML tags into a group of other XML tags, before XSLT processes them. If at all possible, I want to keep the replaced as well as the replacing lines in the same XML document (so, no include-file-style solutions). Example: Oftentimes, my XML files contain repetitive multiple lines, e.g. the following simplified snippet:

<img>	<url>a_midi.jpg</url></img><img>	<url>b_midi.jpg</url></img><img>	<url>c_midi.jpg</url></img>

It would be great, if I could include these multiple lines into a macro tag, placed somewhere near the beginning of the XML file, like this:

<macro id="name_a">	<img>		<url>a_midi.jpg</url>	</img>	<img>		<url>b_midi.jpg</url>	</img>	<img>		<url>c_midi.jpg</url>	</img></macro>

Instead of repeating the initial lines over and over again at various places, I'd just use something like:

 <use_macro id="name_a"/>

Now, I certainly can instruct the XSLT to process the template <macro> matching the name "name_a", when it encounters the <use_macro> tag. However, this is not what I want. The reason is, that above <img> tags are themselves contained in another surrounding tag, say <multi_img>. The XSLT processing this <multi_img> tag considers a lot of other tags contained in itself, which dictate how exactly the XML is transformed into HTML (and sometimes the <img> tags even need to be processed multiple times in different manners.) Hence, what I am looking for, is a way to (1) first transform the XML <use_macro> into the XML contained in the <macro> tag; (2) and then process the resulting XML with XSLT as if there was no <use_macro> tag at all in the first place. Possibly the solution is obvious and I am just overworked, but I can't find what I need (even not after spending some time with Jeni Tennison's "XSLT and XPath / On the edge"). I appreciate pointers (also to the appropriate chapter in Tennison's book), or just the statement "it can not be done". Thanks in advance. Regards,Donar

Edited by Donar
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