allows adding and removing of hierarchy data nodes, replacing of
the value of hierarchy data node members, as well as obtaining the
value of hieryrchy data node members.
Adding and removing must only be supported if the access object
points to the "Children" data member of a node or to the root node.
It will insert a new node or or remove an existing one. If supported
on data nodes, adding must add new data members to the node, removing
must remove data members. However, the mandatory data members (Title,
TargetURL, Children) must never be removable.
Replacing and getting values must be supported be every data node.
reports all changes within the hierarchy that are done through (direct
or indirect) descendants of this element. The same set of changes is
committed to persistent storage and/or made visible to other objects
accessing the same data set, when
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