rail:tDigitString 

an arbitrary string consisting of digits from 0 to 9; not allowing white space, letters; no length restriction

Simple Type Information

Used By

Simple Types rail:tFiveDigits, rail:tFourDigits, rail:tOneDigit, rail:tThreeDigits, rail:tTwelveDigits, rail:tTwoDigits
Attributes rail:aPlaces/@tapTsiType9039Code, rail:aService/@tapTsiType7161Code

Source 

<xs:simpleType name="tDigitString">
  <xs:annotation>
    <xs:documentation>an arbitrary string consisting of digits from 0 to 9; not allowing white space, letters; no length restriction</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:string">
    <xs:pattern value="[0-9]*"/>
  </xs:restriction>
</xs:simpleType>