greenstone@cs.waikato.ac.nz true Demonstration collection illustrating the use of heterogeneous documents. Source documents are about The Beatles pop group in the following formats: HTML, TXT, JPEG, Word, PDF, MIDI, MP3, and MARC file formats. beatlesmm.png Advanced Beatles -- large document:text document:Source document:Title text Title Source Untitled document:text document:Source document:Title () Untitled ()