The use of <tt>core:CityModel</tt> is not explicitely regulated in the specification and in the schema. The multiple use of <tt>core:CityModel</tt> is compliant to the schema and will be validated. | The use of <tt>core:CityModel</tt> is not explicitely regulated in the specification and in the schema. The multiple use of <tt>core:CityModel</tt> is compliant to the schema and will be validated. |