IDOL OnDemand by HP offers an array of data processing APIs for format conversion, image analysis, indexing, search, and textual analysis. Preview capabilities exist to view how many of these RESTful APIs behave in action. The Find Similar API returns documents that are similar to the query you provide. Acceptable query formats include plain text, URL, index type, file, or reference. One can use the 'sort' or 'print' parameters to denote what fields to represent as an output.