<xsd:documentation>The time zone in which well is located.
It is the deviation in hours and minutes from UTC.
This should be the normal time zone at the well and not a seasonally
adjusted value such as daylight savings time.
While the time zone is optional in a date time value, it is strongly
advised that the zone always be specified in each date time value.
The time zone in a date time value may use seasonally adjusted values.</xsd:documentation>