Spatiotemporal annotation graph (STAG): a data model for composite digital objects Smriti Yamini and Amarnath Gupta   View Paper (PDF)   Return to Demo Session 4: Spatial and Temporal DB Abstract In this demonstration, we present a database over complex documents, which, in addition to a structured text content, also has update information, annotations, and embedded objects. We propose a new data model called spatiotemporal annotation graphs (STAG) for a database of composite digital objects and present a system that shows a query language to efficiently and effectively query such database. The particular application to be demonstrated is a database over annotated MS Word and PowerPoint presentations with embedded multimedia objects. ©2006 Association for Computing Machinery