def getRoot(self):
raise NotImplementedError<EOL>
Return the root node of the UI Hierarchy. The node information is wrapped by
:py:class:`AbstractNode <poco.sdk.AbstractNode>`.
See definition of :py:class:`AbstractNode <poco.sdk.AbstractNode>` for more details.

Returns:
    :py:class:`inherit from AbstractNode <poco.sdk.AbstractNode>`: instance that holds the hierarchy data