This interface is valid before the text frame is attached
to a surrounding text, but when attached the values can change
(e.g., due to a revised layout of the surrounding text).
The position is relative to the position of the anchor
[see XTextFrame::getAnchor()]. Size and position are
both measured in 100th mm. The size is not valid if the
size is relative and no layout exists or if the layout is invalid.
This interface is only for the layout. In particular, the
setting of values is only allowed for the layout component of the
owner text of this text component.