Prism is a visualization tool that represents texts based on crowdsourced interpretations. Users are encouraged to highlight words in a text according to categories ("facets"). Users' individual interpretations contribute to a visualization combining the interpretations of all users of the text. As such, it reveals patterns in subjective readings of a text.
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Prism was mentioned in this research abstract available in XML format https://raw.githubusercontent.com/lehkost/ToolXtractor/master/data/xml/2015/POWELL_Daniel_James_Crowdsourcing_the_Text__Contemporar.xml