Question

Here is the original xml file:

<?xml version="1.0" encoding="UTF-8"?>
<TVAMain xml:lang="en-GB" xmlns="urn:tva:metadata:2010" xmlns:tva2="urn:tva:metadata:extended:2010" xmlns:yv="http://refdata.youview.com/schemas/Metadata/2012-10-16" xmlns:mpeg7="urn:tva:mpeg7:2008" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://refdata.youview.com/schemas/Metadata/2012-09-26 ../schemas/youview_metadata_2012-09-26.xsd"> 
<!-- -->
    <ProgramDescription> .............................

I changes some of the content of the xml(but not the one I post here, those codes should be unchanged), then write to a new xml file, but the new xml file content become like this:

<?xml version='1.0' encoding='UTF-8'?>
<TVAMain xmlns="urn:tva:metadata:2010" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://refdata.youview.com/schemas/Metadata/2012-09-26 ../schemas/youview_metadata_2012-09-26.xsd" xml:lang="en-GB">

    <ProgramDescription>....................

you can see that the some contents are lost, and the order is also changed, what should I do in order to avoid any changes to xml?

Answer 1

Attributes on XML tags do not have a fixed order, changing their ordering doesn’t change their meaning.

ElementTree will only write out namespace qualifiers for namespaces actually in use. Your example is very brief, but I suspect it doesn’t make use of the yv and mpeg7 namespaces at all.