data.duration.iso defines the range of attribute values available for representation of a duration in time using ISO 8601 standard formats
Moduletei — The TEI Infrastructure
Used by
<rng:define name="data.duration.iso">
 <rng:data type="token">
  <rng:param name="pattern">[0-9.,DHMPRSTWYZ/:+\-]+</rng:param>
data.duration.iso = token { pattern = "[0-9.,DHMPRSTWYZ/:+\-]+" }
<time dur-iso="PT0,75H">three-quarters of an hour</time>
<date dur-iso="P1,5D">a day and a half</date>
<date dur-iso="P14D">a fortnight</date>
<time dur-iso="PT0.02S">20 ms</time>

A duration is expressed as a sequence of number-letter pairs, preceded by the letter P; the letter gives the unit and may be Y (year), M (month), D (day), H (hour), M (minute), or S (second), in that order. The numbers are all unsigned integers, except for the last, which may have a decimal component (using either . or , as the decimal point; the latter is preferred). If any number is 0, then that number-letter pair may be omitted. If any of the H (hour), M (minute), or S (second) number-letter pairs are present, then the separator T must precede the first ‘time’ number-letter pair.

For complete details, see ISO 8601 Data elements and interchange formats — Information interchange — Representation of dates and times.