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.
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The use of ''core:CityModel'' is not explicitely regulated in the specification and in the schema. The multiple use of ''core:CityModel'' is compliant to the schema and will be validated.
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In order to avoid conflicts while importing CityGML models, it is recommended to use '''exactly one''' instance of <tt>core:CityModel</tt> as '''root element'''.
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In order to avoid conflicts while importing CityGML models, it is recommended to use '''exactly one''' instance of ''core:CityModel'' as '''root element'''.