1. context-aware Trellis (caT) Principal Investigator: Richard Furuta Center for the Study of Digital Libraries and the Department of Computer Science Texas A&M University

2. (3, ∞) (green) Trellis Petri-net based Supports –specification of structure, browsing semantics and access control –time-based hypertext browsing Separates –content from structure –presentation from content Server-side State management caT (context-aware Trellis ) User modeling Text, image and Web (composite) browsers Authoring support for hierarchical nets Browsing experience varies by: –user characteristics –environmental variables - location and time –actions of other users –repeated viewing

3. context-aware Trellis (caT) Resource Realizer Abstract resource handle and data format preferences Resource or pointer to resource Resources Text, images, audio, video, etc. Request resource Resour ce PDA Browser coordinator Desktop (Windows) Browser coordinator Desktop (Linux) Browser coordinator Information Server (Petri Net Engine) Browser Manager Global Data store User Models, Petri net definition files, etc. Query user model User model settings Query user model, net definition files Requested data Query state of net State of the net Web Browser HTTP subsystem HTTP request HTTP response xtb Authoring Tool Image Browser Text Browser Analysis Tool State of the net User actions Devices Clients Server (Linux) Services Display update directives

4. Current Directions Browser development –Support for various media types - Audio/Video, images, hypertext –Support for various metaphors and representations - spatial browser Support for developing large hypertexts –Identification and reuse of templates MIDAS –customize content to suit device characteristics –synchronous browsing across devices