PREFIX dgp10001: <http://data-gov.tw.rpi.edu/vocab/p/10001/>
PREFIX dgp8: <http://data-gov.tw.rpi.edu/vocab/p/8/>
SELECT 
?id,
?label,
?lat,
?long,
?land_use,
?terrain,
?agency,
?mlm,
?active,
?site_id,
AVG(xsd:int(?ozone_8hr_daily_max)) AS ?average
WHERE{
    GRAPH <http://data-gov.tw.rpi.edu/vocab/Dataset_10001>
    {
        ?s dgp10001:latitude            ?lat .
        ?s dgp10001:longitude           ?long .
        ?s dgp10001:land_use            ?land_use .
        ?s dgp10001:terrain             ?terrain .
        ?s dgp10001:agency              ?agency .
        ?s dgp10001:site_id             ?id .
        ?s dgp10001:active              ?active .
        ?s dgp10001:mlm                 ?mlm .
        ?s dgp10001:site_id             ?site_id .
        ?s dgp10001:site_name           ?label
	}
    GRAPH <http://data-gov.tw.rpi.edu/vocab/Dataset_8>
    {
        ?s2 dgp8:site_id                    ?id .
        ?s2 dgp8:ozone_8hr_daily_max        ?ozone_8hr_daily_max
    }
}