This is the top level element representing a table model containing zero or more table sets,
each derived from a single table definition in the table linkbase.
This type represents a table. A table has fixed axes as described by the table headers.
This type represents the headers for a single axis (x, y or z) of a table.
This type represents groups levels in a set of headers for a single axis, for labelling purposes.
This type represents a single level in a set of headers for a single axis.
It contains a series of header labels.