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There are various places in the Processing modeler where I would like to pass the value of a variable. We're iterating through a bunch of features in an input layer. After the processing, we will have a new shapefile per input feature. I want to name each of the new shapefiles based on a value in the new attribute table...this gives me a unique name per new shapefile. For example, using the Field Calculator, We run a simple math operation and store the result in a new result field. We can create a new OutputVector for the calculated result, and I want to use an attribute table value to create the name, like: myResultVector-%SOMECOLUMNLABEL

Where SOMECOLUMNLABEL is the column that contains the attribute of interest, and myResultVector is a nice namespace. If I could name each of the output vectors uniquely, I could save them all in a single folder for future processing.

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