Created attachment 206483 [details]
The result

Have a header file with the following code:

namespace mynamespace {
    class MyClass : QObject {
        Q_OBJECT
        /*!
         * First property.
         */
        Q_PROPERTY(QDeclarativeListProperty<mynamespace::MyItem> firstproperty)
        /*!
         * Second property.
         */
        Q_PROPERTY(QDeclarativeListProperty<mynamespace::MyItem> secondproperty)
    }
}

Running Doxygen with 'GENERATE_XML=YES' option creates an XML file for the
class with single memberdef. The memberdef has:
1) name is 'mynamespace'
2) detaileddescription contains description from both Q_PROPERTY.
The file is attached.

This bug might be related to bug 669071.