|A Vision for Open Hypermedia Systems||Nürnberg and Leggett|
The OSI seven layer model [Hebrawi 1993] describes connections between programs. It allows one to concentrate on one aspect of connectivity by focusing on a particular layer in the model. The lowest layer concerns physical connectivity, while the highest layer describes application-level protocols.
Similarly, we find it useful to think about OHP protocols in an analogous layered way. Figure 9 illustrates a layered model approach to OHP protocols. The OSI Transport Layer (OSI Layer 4) guarantees reliable, ordered byte transport. It seems clear that we should consider building our protocols on top of such a layer, since we should not be concerned with error checking, message ordering, etc. The other three layers are considered below.
2. Scope of the OHSWG...
4. An OHS Reference Architecture Proposal...
5. An OHP Proposal
Appendix A. Generic Encoding Layer Rules
Appendix B. Sproc Generic Layer Rules
Appendix C. Sproc Specific Layer Rules
Appendix D. Sproc Interface Format
Appendix E. Current Protocol Proposal in Sproc Interface Format
Peter J. Nürnberg, John J. Leggett