Each code unit is considered a column, so depending on what a program
is looking to do with the column number, it may need to examine the
actual text on that line and calculate the number that represents
what the program wants to display (e.g. the number of graphemes).
A column number in a line of the XML file.
Each code unit is considered a column, so depending on what a program is looking to do with the column number, it may need to examine the actual text on that line and calculate the number that represents what the program wants to display (e.g. the number of graphemes).