<
xs:restriction 
                        base="
                           
                              xs:string
                        ">
<xs:enumeration 
                           value="other"/>
                        <xs:enumeration 
                           value="unknown"/>
                        <xs:enumeration 
                           value="noPrecipitation"/>
                        <xs:enumeration 
                           value="unidentifiedSlight"/>
                        <xs:enumeration 
                           value="unidentifiedModerate"/>
                        <xs:enumeration 
                           value="unidentifiedHeavy"/>
                        <xs:enumeration 
                           value="snowSlight"/>
                        <xs:enumeration 
                           value="snowModerate"/>
                        <xs:enumeration 
                           value="snowHeavy"/>
                        <xs:enumeration 
                           value="rainSlight"/>
                        <xs:enumeration 
                           value="rainModerate"/>
                        <xs:enumeration 
                           value="rainHeavy"/>
                        <xs:enumeration 
                           value="frozenPrecipitationSlight"/>
                        <xs:enumeration 
                           value="frozenPrecipitationModerate"/>
                        <xs:enumeration 
                           value="frozenPrecipitationHeavy"/>
</
xs:restriction>