New answers tagged parameters
Yes - I think the way to figure out how to do it is by setting up very simple master and sub models. The master model should do no more than take in a string from its tool dialog and then run the sub-model. The sub-model should take as one of its inputs a string and use that string to perhaps create a shapefile using the string as its name. You should be ...
Perhaps the validation issue is where you are editing the models from? ArcGIS gave me trouble if I edited sub-models from the Catalog, but no trouble if I edited them from inside the main model.
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