The lexical space of xsd:time is identical to the time part of xsd:dateTime (hh:mm:ss[Z|(+|-)hh:mm]), and its value space is the set of points in time recurring daily.

The period (one day) is fixed, and no calendars other than Gregorian are supported.

Valid values include 21:32:52, 21:32:52+02:00, 19:32:52Z, 19:32:52+00:00, and 21:32:52.12679.

Invalid values include 21:32 (all the parts must be specified), 25:25:10 (the hour part is out of range), -10:00:00 (the hour part is out of range), and 1:20:10 (all the digits must be supplied).