This view is meaningful only for a static fragment of the hierarchy
Objects' properties may change, but not which properties they have.
Therefore, dynamic elements of the hierarchy (see SetAccess)
do not implement service PropertyHierarchy.
If such elements occur as properties or subproperties of an implementation,
it is not specified whether direct subproperty access using
::com::sun::star::beans::XHierarchicalPropertySet or
::com::sun::star::beans::XMultiHierarchicalPropertySet can
be used to access descendants of such elements.
Similarly, information about such descendants may not be available from
the ::com::sun::star::beans::XHierarchicalPropertySetInfo
the implementation provides.
If an implementation is part of a read-only view of the hierarchy,
all properties and subproperties will be reported as having attribute
PropertyAttribute::READONLY set,
and attempts to change property values will fail.