[pdal] Clipping

[Oveis Hassani jalilian]

Hi,
I am using pdal in python environment in windows 7.
I have a shapefile which consists of several hundreds of polygons. I converted the shapefile to geojson and trying to clip each polygon and write it to a separate LAS file.the following is code for clipping polygon with ID=6. However, I do not know how to loop within the pipeline and clip from polygon 1 to 200 and have 200 outputs with correct naming.
{  "pipeline":[
    {        "type":"readers.las",        "filename":"input.las"                   },
    {      "type":"filters.overlay",      "dimension":"Intensity",      "datasource":"map.vrt",      "layer":"OGRGeoJSON",      "column":"ID"    },
    {      "type":"filters.range",      "limits":"Intensity[6:6]"    },
        "output_6.las"  ]}'''

Thank you!
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