1. A method of searching comprising the steps of: applying a function to individual elements within a digital work to form a set of index elements; storing the index elements as an index for the digital work; receiving a search term; applying the function to one or more individual elements within the search term to convert the search term into one or more converted search term elements; identifying a digital work having an index containing one or more index elements that match one or more of the converted search term elements; and returning search results of the identified digital work.