I am looking at parametric search, where I can highlight in a graph-database style way, the mistakes with the results, by reassigning weights or links, to redo the search, until I get answers that are more correct, based off things like 'water isn't useful for cleaning dried paint, acetone or paint thinners may be more useful'. Is it possible to build such features into any of the open source tools here, or are lacking any gui for the feedback, beyond text and a thumb up or down as one sees in the commercial packages?