Finding a position in a FO file based on FOP's "see position" message

Hi.

I'm using FOP 1.0 to create PDFs. One of my FO files has a problem
with a table that results in this message:

  [java] org.apache.fop.fo.ValidationException: The column-number or
number of cells
  in the row overflows the number of fo:table-columns specified for
the table. (See position 769:2126)

I want to find the spot in the FO file so I can trace it back to the
DocBook elements that cause the problem. What do the numbers 769:2126
refer to? The FO file is one long line so it's not a line and column
reference.

Thanks for your help.

Peter