The depth (or nesting level) of this position within the document tree.
Creates a position instance for a child of this element.
the positions (one-based) of each nesting level of this position (an empty sequence for the root position)
This tree position as a span that can get rendered as part of a numbered title for example.
The position of an element within a document tree.
the positions (one-based) of each nesting level of this position (an empty sequence for the root position)