for $x in
    collection('/db/DRIVER/entity/datasource')
where
    $x//NUMBER_OF_OBJECTS != 0 and not($x//LATITUDE = 0 and $x//LONGITUDE = 0)
return
    <ds>
        <dsId>{$x//RESOURCE_IDENTIFIER/@value/string()}</dsId>
        <name>{$x//OFFICIAL_NAME/text()}</name>
        <lat>{$x//LATITUDE/text()}</lat>
        <lng>{$x//LONGITUDE/text()}</lng>
    </ds>