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POParse xml with lxml - extract element value
 

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    <p>Let's suppose we have the XML file with the structure as follows.</p> <pre><code>&lt;?xml version="1.0" ?&gt; &lt;searchRetrieveResponse xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/zing/srw/ http://www.loc.gov/standards/sru/sru1-1archive/xml-files/srw-types.xsd" xmlns="http://www.loc.gov/zing/srw/"&gt; &lt;records xmlns:ns1="http://www.loc.gov/zing/srw/"&gt; &lt;record&gt; &lt;recordData&gt; &lt;record xmlns=""&gt; &lt;datafield tag="000"&gt; &lt;subfield code="a"&gt;123&lt;/subfield&gt; &lt;subfield code="b"&gt;456&lt;/subfield&gt; &lt;/datafield&gt; &lt;datafield tag="001"&gt; &lt;subfield code="a"&gt;789&lt;/subfield&gt; &lt;subfield code="b"&gt;987&lt;/subfield&gt; &lt;/datafield&gt; &lt;/record&gt; &lt;/recordData&gt; &lt;/record&gt; &lt;record&gt; &lt;recordData&gt; &lt;record xmlns=""&gt; &lt;datafield tag="000"&gt; &lt;subfield code="a"&gt;123&lt;/subfield&gt; &lt;subfield code="b"&gt;456&lt;/subfield&gt; &lt;/datafield&gt; &lt;datafield tag="001"&gt; &lt;subfield code="a"&gt;789&lt;/subfield&gt; &lt;subfield code="b"&gt;987&lt;/subfield&gt; &lt;/datafield&gt; &lt;/record&gt; &lt;/recordData&gt; &lt;/record&gt; &lt;/records&gt; &lt;/searchRetrieveResponse&gt; </code></pre> <p>I need to parse out:</p> <ul> <li>The content of the "subfield" (e.g. 123 in the example above) and</li> <li>Attribute values (e.g. 000 or 001)</li> </ul> <p>I wonder how to do that using lxml and XPath. Pasted below is my initial code and I kindly ask someone to explain me, how to parse out values.</p> <pre><code>import urllib, urllib2 from lxml import etree url = "https://dl.dropbox.com/u/540963/short_test.xml" fp = urllib2.urlopen(url) doc = etree.parse(fp) fp.close() ns = {'xsi':'http://www.loc.gov/zing/srw/'} for record in doc.xpath('//xsi:record', namespaces=ns): print record.xpath("xsi:recordData/record/datafield[@tag='000']", namespaces=ns) </code></pre>
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    1. COYou are using the prefix `xsi` for the namespace `http://www.loc.gov/zing/srw/` - this is valid, but usually `xsi` is used as a prefix for the standard namespace `http://www.w3.org/2001/XMLSchema-instance`.
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