An OHP timeline

This following collection of pointers on OHP - the Open Hypermedia Protocol - is a time-based sequence of events (workshops, working group meetings, etc.) which basically took place since March 1996.

before 1996	The dark ages of OHP - which were not so dark after all! There were a number of efforts targeted at interoperability and standardization already. Most notably, Amy Pearl's paper entitled "Sun's link service: A protocol for open linking" [Pearl, 1989] which introduced the idea of a common protocol for OHSs. And of course, the NIST standardization workshop [Moline et al., 1990] which - similar to the OHSWG's interoperability effort - addressed issues such as a reference architecture, a common data model, interchange formats, etc. for hypertext systems.
1996, March	The original draft of OHP as presented at the 2^nd Workshop on Open Hypermedia Systems: Davis, H., Lewis, A. and Rizk, A. OHP: A draft proposal for a standard open hypermedia protocol.
1997, April	The 3^rd Workshop on Open Hypermedia Systems takes place in conjunction with Hypertext '97, Southampton, UK, April 1997. There are a number of papers on OHP including Anderson, K. A Critique of the Open Hypermedia Protocol, Goose, S., Lewis, A., and Davis, H. OHRA: Towards an Open Hypermedia Reference Architecture and a Migration Path for Existing Systems, Grønbæk, K., and Wiil, U. Towards a Reference Architecture for Open Hypermedia, Nürnberg, P., and Leggett, J. And now for the Tricky Part: Broadening the Applicability of Open Hypermedia Systems, Reich, How OHP's LocSpecs could benefit from ISO/IEC 10744, Rutledge, L., Hardman, L., and van Ossenbruggen, J. Applying the HyTime Model to the Open Hypermedia Protocol LocSpec and Wiil, U., and Whitehead, J. Interoperability and Open Hypermedia Systems
1997, June	Another draft (submitted to JoDI but not accepted) which follows the paper presented at the 2^nd Workshop on Open Hypermedia Systems (see above) and adds some more definitions, protocol headers: Davis, H., Reich, S. and Rizk, A. Towards Interoperability in Open Hypermedia Linkservices.
1997, September	OHP Version 1.0 as presented at the OHS 3.5 Working Group Meeting in Aarhus, September 1997: Davis, H., Reich, S. and Millard, D. A Proposal for a Common Navigational Hypertext Protocol.
1997, December	The JoDI Special Issue on Open Hypermedia is available. All of the papers address interoperability in Open Hypermedia Systems, some of them address directly issues related to the protocol. Interestingly, there is no paper on OHP itself (except the Nürnberg & Leggett paper) but all papers critizise and / or propose changes to the protocol and the reference architecture proposals.
1998, April	A short paper submitted to Hypertext '98, Pittsburgh, Pennsylvania, June 1998: Davis, H., Millard, D., Reich, S., Nürnberg, P. and Wiil, U.: OHP-Nav — Superseding the Browser as a Nexus for Navigating Hypermedia Objects. This paper did not get accepted.
1998, April	A paper presented at the Workshop "Towards a New Generation of HTTP", A workshop on global hypermedia infrastructure, held in conjunction with the 7th Int'l WWW Conference Brisbane, Australia, April 14-18 1998: Davis, H., Millard, D., Reich, S. OHP - Communicating between Hypermedia Aware Applications.
1998, June	A demonstration of OHP-Nav at Hypertext '98, Pittsburgh, Pennsylvania, June 1998: D. Millard, D. Chandler, L. Pind, L. Sloth, H. Davis, P. Nürnberg, S. Reich, U. Wiil, K. Grønbæk, K. Anderson: Talking OHP-Nav - Demonstrating Interoperability in Open Hypermedia Systems.
1998, June	The 4^th Workshop on Open Hypermedia Systems is held in conjunction with Hypertext '98 and many papers address issues of OHP. They include Anderson, K. M. Client-Side Services for Open Hypermedia - Getting past the "foo"..., Grønbæk, K. OHS Interoperability - issues beyond the protocol, Millard, D., Reich, S., Davis, H. Reworking OHP: the Road to OHP-Nav, Nürnberg, P. J., and Leggett, J. J. Assessment of the Current State of Open Hypermdia Standardization Efforts, Trigg, R. H. A straw model for link traversal in open hypermedia systems.
1998, September	The OHS 4.5 Working Group Meeting takes place in sunny Southampton (18.-20. Sept).
1999, February	The 5^th Workshop on Open Hypermedia Systems takes place in conjunction with Hypertext 99 (Darmstadt), the last Hypertext Conference in this century. Again, several papers on OHP. See the proceedings page for details. Also at HT99: several (!) demos around OHP. Notably, one of the demos showed the usage of services using a separate protocol [(see Services)]; another one showed a spatial client and server (again, using a dedicated protocol) [(see the CAOS system)]; and a third one showed collaboration using an extension to the existing navigational protocol[(see Collaboration)]. At HT99 a Technical Briefing on the Open Hypermedia Systems Working Group's Interoperability effort is presented. The PowerPoint slides can be found here.
1999, September	The OHS 5.5 Working Group Meeting is planned to take place on Sept. 17-19, in Esbjerg, DK


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A Timeline of the Open Hypermedia Protocol