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POHow to parse strings representing xml.dom.minidom nodes in python?
 

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  1. POHow to parse strings representing xml.dom.minidom nodes in python?
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    <p>I have a collection of nodes xml.dom.Node objects created using xml.dom.minidom. I store them (individually) in a database by converting them to a string using the toxml() method of a the Node object.</p> <p>The problem is that I'd sometimes like to be able to convert them back to the appropriate Node object using a parser of some kind. As far as I can see the various libraries shipped with python use Expat which won't parse a string like '' or indeed anything which is not a correct xml string.</p> <p>So, does anyone have any ideas? I realise I could pickle the nodes in some way and then unpickle them, but that feels unpleasant and I'd much rather be storing in a form I can read for maintenance purposes. Surely there is something that will do this?</p> <p>In response to the doubt expressed that this is possible, an example of what I mean:</p> <pre><code>&gt;&gt;&gt; import xml.dom.minidom &gt;&gt;&gt; x=xml.dom.minidom.parseString('&lt;a&gt;foo&lt;b&gt;thing&lt;/b&gt;&lt;/a&gt;') &gt;&gt;&gt; x.documentElement.childNodes[0] &lt;DOM Text node "u'foo'"&gt; &gt;&gt;&gt; x.documentElement.childNodes[0].toxml() u'foo' &gt;&gt;&gt; xml.dom.minidom.parseString(x.documentElement.childNodes[0].toxml()) Traceback (most recent call last): File "&lt;stdin&gt;", line 1, in &lt;module&gt; File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/xml/dom/minidom.py", line 1928, in parseString return expatbuilder.parseString(string) File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/xml/dom/expatbuilder.py", line 940, in parseString return builder.parseString(string) File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/xml/dom/expatbuilder.py", line 223, in parseString parser.Parse(string, True) xml.parsers.expat.ExpatError: syntax error: line 1, column 0 </code></pre> <p>In other words the ".toxml()" method does not create something that Expat (and hence out of the box parseString) will parse. </p> <p>What I would like is something that will parse u'foo' into a text node. I.e. something that will reverse the effect of .toxml()</p>
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    1. USFrancis Davey
    1. USFrancis Davey
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    1. COi don't see how a call to `toxml()` might generate an incorrect XML fragment... thus all string generated by `toxml()` should be parseable by the `parse()` or `parseString()` functions of `xml.dom.minidom`...
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      1. POHow to parse strings representing xml.dom.minidom nodes in python?
      1. USAdrien Plisson
    2. COthank you for the example. indeed a text node is rendered as plain text, which is not valid xml.
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      1. POHow to parse strings representing xml.dom.minidom nodes in python?
      1. USAdrien Plisson
 

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