Intervals of integers, dates etc, use the symbols '>', '<' for expressing ones-sided intervals. However, if interval values are to be used in dADL, which appears perfectly reasonable, these symbols clash with the dADL block delimiters.
Intervals should be delimited with the '|' symbol,
making for a visually intuitive representation of an interval,
e.g. |100..200|, |>=60|, |<.005| and so on.