According [rfc5985](https://tools.ietf.org/html/rfc5985) `responseTime` may contain values 1. `emergencyRouting` 2. `emergencyDispatch` 3. non Negative Integer value
```xml <!-- responseTime Type --> <xs:simpleType name="responseTimeType"> xs:union xs:simpleType <xs:restriction base="xs:token"> <xs:enumeration value="emergencyRouting"/> <xs:enumeration value="emergencyDispatch"/> </xs:restriction> </xs:simpleType> xs:simpleType <xs:restriction base="xs:nonNegativeInteger"> <xs:minInclusive value="0"/> </xs:restriction> </xs:simpleType> </xs:union> </xs:simpleType> ```