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#<Q>
{ let $x1 := bmfXmlInDoc//Building/RoomDatas/Room [Purpose = '住宅' ]
let $x2 := bmfXmlInDoc//Building/RoomDatas/Room [Purpose = '商铺' ]
return sum( $x1/data(ArchArea)) +sum( $x2/data(ArchArea))
}</Q>#
距离打开宝箱还剩7天
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