Had to build a simple type for GNbID length to restrict the integer length

  <xs:complexType name="GNbID">

    <xs:sequence>

      <xs:element name="BitLength" type="xs:integer" minInclusive="22" maxInclusive="32"/>

      <xs:element name="BitLength" type="GNbIDLength"/>

      <xs:element name="GNbValue" type="GNbValue"/>

    </xs:sequence>

  </xs:complexType>

  <xs:simpleType name="GNbIDLength">

    <xs:restriction base="xs:integer">

      <xs:minInclusive value="22"/>

      <xs:maxInclusive value="32"/>

    </xs:restriction>

  </xs:simpleType>

  <xs:simpleType name="GNbValue">

    <xs:restriction base="xs:string">

      <xs:pattern value="([A-Fa-f0-9]{6,8})"/>