CAS_PGE's ExternExtractorMetWriter config file

[Davoodi, Faranak (388J)]

I have a couple of out put products that I am trying to extract extra metadata 
and add them to the final .met files. Here is how I run my files:

Python  [someBinDir]/ncdump  [PathToPythonExtractor]/extractor1.py  
[PathToOutputProduct]/productName [PathToOutPutMet]

How should I write the extern extractor config file:


<?xml version="1.0" encoding="UTF-8"?>

<cas:externextractor xmlns:cas="http://oodt.jpl.nasa.gov/1.0/cas";>

    <exec metFileExt="tmp.cas">
        <extractorBinPath 
envReplace="true">[PathToPythonExtractor]</extractorBinPath>
        <args>
            <arg>python</arg>
            <arg>[someBinDir]/ncdump</arg>

             <arg>extractor1.py</arg>

            <arg isDataFile="true"/>
            <arg>-reader</arg>
            <arg>Rtp3FileReader</arg>
            <arg>--metFile</arg>
            <arg>-toFile</arg>
            <arg isMetFile="true"/>
            <arg>-writer</arg>
            <arg>XmlCasWriter</arg>
        </args>
    </exec>


</cas:externextractor>

Thanks,
Faranak