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POHow do I combine results from zip-filter queries on an xml tree in Clojure?
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  1. POHow do I combine results from zip-filter queries on an xml tree in Clojure?
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    copied!<p>I want to combine the results of three zip-filter queries on an xml tree. The XML I am parsing looks like this:</p> <pre><code>&lt;someroot&gt; &lt;publication&gt; &lt;contributors&gt; &lt;person_name&gt; &lt;surname&gt;Surname A&lt;/surname&gt; &lt;/person_name&gt; &lt;person_name&gt; &lt;given_name&gt;Given B&lt;/given_name&gt; &lt;surname&gt;Surname B&lt;/surname&gt; &lt;suffix&gt;Suffix B&lt;/suffix&gt; &lt;/person_name&gt; &lt;/contributors&gt; &lt;/publication&gt; &lt;/someroot&gt; </code></pre> <p>From this example you can see that <code>&lt;given_name&gt;</code> and <code>&lt;suffix&gt;</code> are optional - only <code>&lt;surname&gt;</code> is required. Here in lies my problem - if I run three separate queries the responses I get will be out of kilter with each other:</p> <pre><code>(xml-&gt; xml :publication :contributors :person_name :given_name text) (xml-&gt; xml :publication :contributors :person_name :surname text) (xml-&gt; xml :publication :contributors :person_name :suffix text) </code></pre> <p>After running these three queries I will be left with three sequences whose cardinalities do not match; <code>given_name</code> and <code>suffix</code> will be length 1 while <code>surname</code> will be length 2. This makes it impossible for me to combine the components of each name. I need to write a single query that will perform this name concatenation during sequence construction.</p> <p>I'm looking at the very sparse documentation for <code>clojure.contrib.zip-filter.xml</code> and can't figure out how I could do this (or if it is even possible). Unfortunately I am a Clojure (and Lisp) newbie! Can anyone point out how I can write a query that will concatenate three other embedded queries?</p>
 

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