rail:tCounter 

generic type for counters (e.g. number of equipment), allowing zero

Simple Type Information

Used By

Attributes rail:aAssemblyNameNumber/@count, rail:aBlockPartSequence/@dayOffset, rail:aCirculation/@repeatCount, rail:aCirculation/@vehicleCounter, rail:aCirculation/@vehicleGroupCounter, rail:aDoors/@number, rail:aElectricalWagonCoupler/@numberContacts, rail:aFormation/@formationCount, rail:aMaintenanceInterval/@maximumIntervalDays, rail:aPantograph/@fittedSection, rail:aPlaces/@count, rail:aPropulsion/@numberNotches, rail:aRackTraction/@number, rail:aService/@count, rail:aTractionMotor/@numberPolePairs, rail:aVehicle/@numberDrivenAxles, rail:aVehicle/@numberNonDrivenAxles, rail:aVehicleRef/@vehicleCount, rail:tContractor/@subLevel

Source 

<xs:simpleType name="tCounter">
  <xs:annotation>
    <xs:documentation>generic type for counters (e.g. number of equipment), allowing zero</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:nonNegativeInteger"/>
</xs:simpleType>