The presence of a non-text object is sensed in a mixed object document to be archived in an information retrieval system. In addition to text objects, a mixed object document can contain non-text objects such as image objects, graphics objects, formatted objects, font objects, voice objects, video objects...http://www.google.fr/patents/US5404435?utm_source=gb-gplus-shareBrevet US5404435 - Non-text object storage and retrieval
