XQuery implementation outputs CDATA sections as escaped XML instead of raw data

XQuery on CDATA sections returns result as escaped XML text instead of original raw data.

Example code (see complete project attached) :

QXmlQuery xQuery;
xQuery.setQuery("doc('test.xml')/xml/string()");
QString result;
xQuery.evaluateTo(&result);
qDebug() << "Result = " << result;

With the following input test.xml file :

<xml>
<![CDATA[<tag>test</tag>]]>
</xml>

returns escaped output:
&lt;tag&gt;test&lt;/tag&gt;

instead of the correct output :
<tag>test</tag>

XQuery engine should leave the CDATA section untouched without any extra encoding because that's what CDATA sections are meant for.