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copied!<p>If you're loading it into memory, it doesn't really matter what form the XML takes - make it the easiest to read or write by hand, I would suggest. When you load it into memory, <em>then</em> you should transform it into an appropriate data structure. (The exact nature of the data structure would depend on the exact nature of the requirements.)</p> <p>EDIT: This is to counter the arguments made in comments by Dimitre:</p> <p>I'm not sure whether you thought I was suggesting that people implement their own hashtable - I certainly wasn't. Just keep a straight hashtable or perhaps a <a href="http://google-collections.googlecode.com/svn/trunk/javadoc/com/google/common/collect/Multimap.html" rel="nofollow noreferrer">MultiMap</a> for each column which you want to use as a key. Developers know how to use hashtables.</p> <p>As for the runtime efficiency, which do you think is going to be more efficient:</p> <ul> <li>You build some XSLT (and bear in mind this <em>is</em> foreign territory, at least relatively speaking, for most developers)</li> <li>XSLT engine parses it. This step <em>may</em> be avoidable if you're using an XSLT library which lets you just parameterise an existing query. Even so, you've got <em>some</em> extra work to do.</li> <li>XSLT engine hits hashtables (you hope, at least) and returns a node</li> <li>You convert the node into a more useful data structure</li> </ul> <p>Or:</p> <ul> <li>You look up appropriate entries in your hashtable based on the keys you've been given, getting straight to a useful data structure</li> </ul> <p>I think I'd trust the second one, personally. Using XSLT here feels like using a screwdriver to bash in a nail...</p>

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