Element Tree doesn't load a Google Earth-exported KML

I have a problem related to a Google Earth exported KML, as it doesn't seem to work well with Element Tree. I don't have a clue where the problem might lie, so I will explain how I do everything.

Here is the relevant code:

    kmlFile = open( filePath, 'r' ).read( -1 ) # read the whole file as text     kmlFile = kmlFile.replace( 'gx:', 'gx' )   # we need this as otherwise the Element Tree parser                                                # will give an error      kmlData = ET.fromstring( kmlFile )     document = kmlData.find( 'Document' ) 

With this code, ET (Element Tree object) creates an Element object accessible via variable kmlData. It points to the root element ('kml' tag). However, when I run a search for the sub-element 'Document', it returns None. Although the 'Document' tag is present in the KML file!

Are there any other discrepancies between KMLs and XMLs apart from the 'gx: smth' tags? I have searched through the KML files I am dealing with and found nothing suspicious. Here is a simplified structure of an KML file the program is supposed to deal with:

<?xml version="1.0" encoding="UTF-8"?> <kml xmlns="http://earth.google.com/kml/2.2"> <Document>    <name>UK.kmz</name>    <Style id="sh_blu-blank">     <IconStyle>         <scale>1.3</scale>         <Icon>             <href>http://maps.google.com/mapfiles/kml/paddle/blu-blank.png</href>         </Icon>         <hotSpot x="32" y="1" xunits="pixels" yunits="pixels"/>     </IconStyle>     <ListStyle>         <ItemIcon>             <href>http://maps.google.com/mapfiles/kml/paddle/blu-blank-lv.png</href>         </ItemIcon>     </ListStyle>   </Style>     [other style tags...]   <Folder>     <name>UK</name>     <Placemark>         <name>1262 Crossness Pumping Station</name>         <LookAt>             <longitude>0.1329926667038817</longitude>             <latitude>51.50303535104574</latitude>             <altitude>0</altitude>             <range>4246.539753518848</range>             <tilt>0</tilt>             <heading>-4.295161152207489</heading>             <altitudeMode>relativeToGround</altitudeMode>             <gx:altitudeMode>relativeToSeaFloor</gx:altitudeMode>         </LookAt>         <styleUrl>#msn_blu-blank15000</styleUrl>         <Point>             <coordinates>0.1389579668507301,51.50888923518947,0</coordinates>         </Point>     </Placemark>          [other placemark tags...]   </Folder> </Document> </kml> 

Do you have an idea why I can't access any sub-elements of 'kml'? By the way, Python version is 2.7.

Source: http://stackoverflow.com/questions/17811880/element-tree-doesnt-load-a-google-earth-exported-kml

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