is the basic service providing read access to a group element of the
hierarchy.
Any child and descendant objects support modifying access as well,
unless they represent a read-only tree element as indicated by
PropertyAttribute::READONLY.
This service extends the interface
::com::sun::star::container::XNameAccess supported
by service GroupAccess to allow changing values.
This strongly overlaps with functionality available through
PropertyHierarchy (from GroupAccess), so that
xGroup.setPropertyValue( aName, aValue ) is equivalent to
xGroup.replaceByName( aName, aValue ).
Elements of this group may be replaced only if they are of simple type.
The type returned by
::com::sun::star::container::XElementAccess::getElementType()
must not be an interface type. Replacing whole subtrees is not supported.