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Chandler/Westwood: Progress in Open-Source Collaboration

Explore the progress in open-source collaboration for open-source applications in universities, featuring an update on Chandler/Westwood developments and calendaring standards like CalDAV 0.4. Learn about major milestones, functional requirements, and future work in this field.

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Chandler/Westwood: Progress in Open-Source Collaboration

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  1. Chandler/Westwood: Progress in Open-Source Collaboration Open Source Applications Foundation EDUCAUSE October 2004

  2. Speakers • Jack McCredie, U.C. Berkeley • Oren Sreebny, U. Washington • University user perspective • Mitch Kapor, OSAF • Chandler/Westwood update • Lisa Dusseault • Network and sharing architecture • Calendaring standards - CalDAV

  3. 0.4: Our Big Bang Release recap • Goal was to be experimentally usable for a few key end-user tasks. • More on wiki page http://wiki.osafoundation.org/bin/view/Chandler/ZeroPointFourPlanning • Release date: Oct 26, 2004

  4. 0.4 What We Planned • Goal is to be experimentally usable for a few key end-user tasks: • Enter and edit items and collections • Organize and label items and collections • Share and communicate items and collections • UI Landscape: Sidebar, Tabs, Summary & Detail views • Initial functionality for Email, Calendar, Tasks & Contacts • Base security framework • Elementary sharing: e.g. share Calendar and Contacts

  5. 0.4 What We Will Deliver Experimentally usable: Enter and edit items & collections Organize and label items & collections Share and communicate items & collections UI landscape: Sidebar, Tabs, Summary & Detail views Initial functionality for: Email, Calendar, Tasks, & Contacts Elementary end-to-end collection sharing: Calendar, Contacts, & Item Collections Base security framework

  6. 0.4 Demo

  7. Product Road Map

  8. Major Milestones Ahead • Next release: 0.4 - first experimentally usable end-user release • 0.5 Calendar “Dog food” release: Be able to perform basic individual and collaborative calendaring tasks within a small workgroup • The “Kibble” Release: Target early adopters. OSAF uses Chandler on a day-to-day basis • Kibble+ Release - Polish Kibble from real-world usage • Westwood Release: for Higher Education • Deprecating Canoga as a release target - not targeting groups beyond early adopters

  9. Client Product Roadmap

  10. Things We Learned • Underestimated cost of ambition • Hard decisions about product strategy and focus could have been made earlier • Proved harder to build engineering organization • Cross-platform and rich clients are hard • Build and integration work is non-trivial

  11. Sharing: Functional Requirements • Synchronize Calendars • View somebody else’s calendar offline • Add events to shared calendars • Discuss availability • Share/synchronize Contacts, tasks, email • Sharing “circle” allowed read/write access • Shares should be available >90% of the time Functional Requirements Drive Architecture

  12. Network and Sharing Architecture, 0.4 Email Sharing Clients share by synchronizing torepository IMAP, SMTP HTTP/WebDAV

  13. Sharing Data Model Home directory Shared Calendar Sharing Server Shared Todos WebdavCollection HTTPresource

  14. Sharing via WebDAV • Solves repository access requirements • Browse, search, synchronize for offline use • Multiple authors, permissions • Clear data model for any application semantics • Properties • Collections and resources • Provides additional benefits • URLs • Interoperability • Known extensible protocol • Proven, deployed, open technology • Existing libraries, server implementations, scalable

  15. WebDAV is application neutral text img vCard vCal Data formats WebDAV Data access SSL/TLS Data privacy TCP Transport Extend classic protocol layering

  16. Future work • Add support for Calendaring Standards • CalDAV • iCalendar (import/export) • Invitations via iMIP (in iCalendar format) • More messaging options • POP3 • XMPP?

  17. CalDAV • Standard for HTTP calendar access • Re-use GET, iCalendar format • Standard for WebDAV calendar authoring • Re-use PROPPATCH, PROPFIND • Re-use WebDAV permissions (RFC3744) • Support publishing as well as sharing • Publishing concert dates, club events • Support scheduling? • Requirement for corporate calendaring…

  18. CalDAV Data Model Calendar VEVENTs VTODOs WebdavCollection HTTP resource & iCalendar file

  19. CalDAV status • CALSCH IETF Working Group Closed • RFC2445 (iCalendar), RFC2446 (iTIP), RFC2447 (iMIP) all completed in 1998 • CAP proposal: six years work, now orphaned • Effort to form new IETF Working Group • Focus instead on revising iCalendar • iCalendar simplification & interoperability • CalConnect consortium helps test and document • CalDAV proposed to replace CAP • Industry support and implementations started

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