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I initially posted a question regarding the use of the GpFeatureRecordSetLayer Parameter in a Python Toolbox I am creating.

Original Question: Using GPFeatureRecordSetLayer in Python Toolbox for ArcMap?

In summary when running the Toolbox in any version of ArcMap from 9.x to 10.4 a bug in the system would not recognise the GPFeatureRecordSetLayer. The purpose of this layer is to allow the user to generate a polygon defining a study area from which the Tool would run.

I have been considering alternatives, and was thinking having an edit session start when the tool is opened allowing for the editing of a explicitly defined Polygon Layer might be the solution.

My question is: Is it possible to initiate an edit session, editing an existing layer when a Tool / Toolbox is opened? If so, where would you call the edit session? My thought would be within defining the parameters, but I am not sure how best to handle this in the code.

Please see my original code below:

def getParameterInfo(self):
        '''parameter definitions for GUI'''
        params = None
        param0 = arcpy.Parameter(
        displayName = "AOI",
        name = "Choose you Area of Interest",
        datatype = "GPFeatureRecordSetLayer",
        parameterType = "Required",
        direction = "Input")

        param0.value = r"C:\Data\AOI.lyr"

        param1 = arcpy.Parameter(
        displayName = "Project Name",
        name = "Please provide a project for this search",
        datatype = "GPString",
        parameterType = "Required",
        direction = "Input")

        param1.value = "Input Text"

        param2 = arcpy.Parameter(
        displayName = "Project Identifier",
        name = "Please provide an unique identifer for this search - Text Only",
        datatype = "GPString",
        parameterType = "Required",
        direction = "Input")

        param2.value = "Input Text"

        params = [param0 , param1, param2]
        return params

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