Show only Ploygon or Point orPolyline

[anhtin]

hi all
i am developing gis application  use Mapserver(API) and PostGis and use
mapfile
On my app have function show to a region positon  on the map
Ex: i have layer Province into is District (Province and Distric is type
Polygon)
When i chose a province so my map show only Province i chosed and only all
distric into this porvince. But Other polygon on   Province and distric must
visible
how will i do that ????
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