Line numbers

Every line in a work file has an 8-digit line number (range of values 0000.0001 to
9999.9999). However, there does not have to be a line for every line number.
The line numbers permit the unique identification of the lines in a work file. In addition, the numerical values of the line numbers define a sequence for all the lines in a work file (if a line has a lower number than another then it must precede the other line).
This means that it is possible to specify line ranges by defining the lowest and highest line number in the range.
In many EDT statements which process lines in whatsoever form, line numbers are used in order to define the lines or line ranges that are to be processed by the statement.