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POXML complex Pattern-Matching expressions
 

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    <p>I need to match patterns on a set of XML documents (all with the same schema), and when a pattern matches, I need to retrieve the content and do some specific transformations on it.</p> <p>I have a list of those "patterns", that are similar to regular expressions, but with elements and attributes. </p> <p>pseudo-pattern example:</p> <pre><code>(//ELEMENTx) (node())* (//ELEMENTy[@ATTRIBUTEz]) (node())* (//@ATTRIBUTEw) </code></pre> <p>I used XPath syntax inside the parenthesis only. Other quantifiers could be used...</p> <p>This would match when the xml has ELEMENTx as the first element, ends with one element that has ATTRIBUTEw, and in between needs to have an ELEMENTy with ATTRIBUTEz. </p> <p>Note that I need to match the whole document for each whole pattern, not just part of it.</p> <p>The nesting of elements does not matter in this case (ELEMENTy could be a child of ELEMENTx, or not), but they need to have that specific order.</p> <p>EDIT: To clarify, the XML have trees with syntactic information. I need to match syntactic patterns. </p> <p>Example:</p> <pre> TOP / \ X Y |\ |\ 1 2 3 4 </pre> <p>Matching patterns could be (node names, assuming no attributes):<br> X Y<br> 1 * Y<br> X 3 4<br> 1 * 4 </p> <hr> <p>I could use XPath to get each individual part of the pattern, but then I loose the sense of order...if I do two XPath queries, I don't know the positions of the results relative to each other.</p> <p>After matching, I will have rules for each pattern, that specify some transformations on the content (change order etc).</p> <p>Is there any way to do something like this using XPath or XQuery? I could use DOM and make the pattern matching code myself, but maybe there is already a better way to do this.</p> <p>Thanks for any pointers.</p>
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