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POCompare XML snippets?
 

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    <p>Building on <a href="https://stackoverflow.com/questions/794331/xml-comparison-in-c">another SO question</a>, how can one check whether two well-formed XML snippets are semantically equal. All I need is "equal" or not, since I'm using this for unit tests.</p> <p>In the system I want, these would be equal (note the order of 'start' and 'end'):</p> <pre><code>&lt;?xml version='1.0' encoding='utf-8' standalone='yes'?&gt; &lt;Stats start="1275955200" end="1276041599"&gt; &lt;/Stats&gt; # Reordered start and end &lt;?xml version='1.0' encoding='utf-8' standalone='yes'?&gt; &lt;Stats end="1276041599" start="1275955200" &gt; &lt;/Stats&gt; </code></pre> <p>I have lmxl and other tools at my disposal, and a simple function that only allows reordering of attributes would work fine as well! </p> <hr> <p>Working snippet based on IanB's answer:</p> <pre><code>from formencode.doctest_xml_compare import xml_compare # have to strip these or fromstring carps xml1 = """ &lt;?xml version='1.0' encoding='utf-8' standalone='yes'?&gt; &lt;Stats start="1275955200" end="1276041599"&gt;&lt;/Stats&gt;""" xml2 = """ &lt;?xml version='1.0' encoding='utf-8' standalone='yes'?&gt; &lt;Stats end="1276041599" start="1275955200"&gt;&lt;/Stats&gt;""" xml3 = """ &lt;?xml version='1.0' encoding='utf-8' standalone='yes'?&gt; &lt;Stats start="1275955200"&gt;&lt;/Stats&gt;""" from lxml import etree tree1 = etree.fromstring(xml1.strip()) tree2 = etree.fromstring(xml2.strip()) tree3 = etree.fromstring(xml3.strip()) import sys reporter = lambda x: sys.stdout.write(x + "\n") assert xml_compare(tree1,tree2,reporter) assert xml_compare(tree1,tree3,reporter) is False </code></pre>
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