QT: XML Parsing By XPath

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XML

QT

Hi, I'm going to parse the word document by QT XML library and then I hope use the xpath expressions to do it.
But QT XQuery doesn't works well.

Here is xml file I want to parse.

<?xml version="1.0" encoding="UTF-8"?>
<Types xmlns="http://schemas.openxmlformats.org/package/2006/content-types">
<Default Extension="rels" ContentType="application/vnd.openxmlformats-package.relationships+xml"/>
<Default Extension="xml" ContentType="application/xml"/>
<Default Extension="jpg" ContentType="image/jpeg"/>
<Override PartName="/word/document.xml" ContentType="application/vnd.openxmlformats-officedocument.wordprocessingml.document.main+xml"/>
<Override PartName="/word/styles.xml" ContentType="application/vnd.openxmlformats-officedocument.wordprocessingml.styles+xml"/>
<Override PartName="/word/stylesWithEffects.xml" ContentType="application/vnd.ms-word.stylesWithEffects+xml"/>
<Override PartName="/word/settings.xml" ContentType="application/vnd.openxmlformats-officedocument.wordprocessingml.settings+xml"/>
<Override PartName="/word/webSettings.xml" ContentType="application/vnd.openxmlformats-officedocument.wordprocessingml.webSettings+xml"/>
<Override PartName="/word/fontTable.xml" ContentType="application/vnd.openxmlformats-officedocument.wordprocessingml.fontTable+xml"/>
<Override PartName="/word/theme/theme1.xml" ContentType="application/vnd.openxmlformats-officedocument.theme+xml"/>
<Override PartName="/docProps/core.xml" ContentType="application/vnd.openxmlformats-package.core-properties+xml"/>
<Override PartName="/docProps/app.xml" ContentType="application/vnd.openxmlformats-officedocument.extended-properties+xml"/>
</Types>

And I made the xq file as follows. I made it according the qt examples/recipes.
But it doesn't parse the XML file. So I move my files to qt examples/recipes but it also failed.

(: Get Parts From  :)
declare variable $inputDocument external;

doc($inputDocument)/Types/Override

I appreciate your helps...