Checks only the ENTRY
and TGROUP
elements,
the first to find the column number, and the second to find the total
number of columns.
Node we want the column number of.
If this is not an ENTRY
element, then the column number will be
returned as zero.
Type: list of numbers
A list of numbers, where
the car
is the current column number,
and the cadr
is the total number of columns.
If the argument is not for an ENTRY
element,
then the current column number will be returned as zero.
If the node doesn't have a TABLE
in its ancestry,
then return #f
.