Python 2.5 ElementTree handle xml node with namespace

Question

I'm using Python2.5, ElementTree 1.2 to parse XML document, which looks like:

<cm:CompositeMessage xmlns:cm="http://www.xyz.com">
    <cm:Message>
        <cm:Body format="text/xml">
            <CHMasterbook >
                    <event>
                            <eventName>Snapshot</eventName>
                            <date>2013-10-25</date>
                            <time>20:59:02</time>
                    </event>
            </CHMasterbook>
         </cm:Body>
     </cm:Message>
</cm:CompositeMessage>

After I register the namespace

ET._namespace_map['http://www.xyz.com'] = 'cm'

I can parse the XMLdocument and locate the 'event' node

tree = ElementTree(fromstring(xml))
tree.findall('./{http://www.xyz.com}Message/{http://www.xyz.com}Body/CHMasterBook/event')

But if 'CHMasterbook' node has namespaces like

<CHMasterbook xmlns="http://uri.xyz.com/Chorus/Message" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://uri.xyz.com/Chorus/Message ../schema/chorus-master-book-msg.xsd">

tree.findall only returns empty list and it can no longer locate 'event' node. I also tried to register those namespaces like:

ET._namespace_map['http://uri.xyz.com/Chorus/Message'] = 'xmlns'
ET._namespace_map['http://www.w3.org/2001/XMLSchema-instance'] = 'xmlns:xsi'
ET._namespace_map['http://uri.xyz.com/Chorus/Message ../schema/chorus-master-book-msg.xsd'] = 'xsi:schemaLocationi'

But it didn't help.

I can only use Python 2.5 and ElementTree 1.2 (can't use lxml). Does anyone know how to locate the 'event' node with 'CHMasterbook' having those namespaces?

paul trmbrth · Accepted Answer · 2013-11-24 23:36:42Z

1

Try this:

tree = ElementTree(fromstring(xml))
tree.findall('./{http://www.xyz.com}Message'
             '/{http://www.xyz.com}Body'
             '/{http://uri.xyz.com/Chorus/Message}CHMasterbook'
             '/{http://uri.xyz.com/Chorus/Message}event')

In your example, you use CHMasterbook and sometimes CHMasterBook. Remember case is important in XML.

edited Nov 24, 2013 at 23:36

answered Nov 24, 2013 at 23:12

paul trmbrth

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1 Comment

wd113 Over a year ago

Thanks for your answer. It works for me. CHMasterbook is a typo, and should be CHMasterBook.

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