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Enhancing Open-Source Collaboration: Chandler/Westwood Progress Update

Dive into the evolution of open-source applications foundation with insights from industry experts in this comprehensive update on Chandler/Westwood collaboration. Explore the latest features and goals achieved in the release, future milestones, user perspectives, sharing functionality, security framework, and product roadmaps. Discover the latest in calendaring standards, functional requirements, network and sharing architecture, and future work towards enhancing collaboration through CalDAV. Stay informed on the current industry trends and technological advancements in open-source applications development.

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Enhancing Open-Source Collaboration: Chandler/Westwood Progress Update

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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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