gml:TimeIntervalLengthType

temporal.xsd

      This type extends the built-in xsd:decimal simple type to allow floating-point 
      values for temporal length. According to  the ISO 11404 model you have to use 
      positiveInteger together with appropriate values for radix and factor. The 
      resolution of the time interval is to one radix ^(-factor) of the specified 
      time unit (e.g. unit="second", radix="10", factor="3" specifies a resolution 
      of milliseconds). It is a subtype of TimeDurationType.