\target qqmlpropertymap_derived_parentobj
\fn QQmlPropertyMap::QQmlPropertyMap(DerivedType *derived, QObject *parentObj)

Constructs a bindable map with parent object \a parent.  Use this constructor
In classes derived from QQmlPropertyMap.

\note When deriving a class from QQmlPropertyMap, use the
          \l {qqmlpropertymap_derived_parentobj}{protected two-argument    constructor}
          which ensures that the class is correctly registered with the 
          Qt \l {Meta-Object System}.

/home/nico/dev/gerrit/stable/qtdeclarative/src/qml/util/qqmlpropertymap.cpp:134: warning: Can't link to 'qqmlpropertymap_derived_parentobj'