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hCalendar

{{Short description|Microformat}}

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{{About||details of hCalendar used on Wikipedia|:Wikipedia:Microformats}}

hCalendar (short for HTML iCalendar) is a microformat standard for displaying a semantic (X)HTML representation of iCalendar-format calendar information about an event, on web pages, using HTML classes and rel attributes.

It allows parsing tools (for example other websites, or browser add-ons[http://microformats.org/wiki/browsers Microformats.org: Browser Support for Microformats] like Firefox's Operator extension) to extract the details of the event, and display them using some other website, index or search them, or to load them into a calendar or diary program, for instance. Multiple instances can be displayed as timelines.

Example

Consider this semi-fictional example:



The English Wikipedia was launched


on 15 January 2001 with a party from


2-4pm at


Jimmy Wales' house


(more information).

The HTML mark-up might be:

The English Wikipedia was launched

on 15 January 2001 with a party from

2-4pm at

Jimmy Wales' house

(more information)

hCalendar mark-up may be added using span HTML elements and the classes vevent, summary, dtstart (start date), dtend (end date), location and url:

The English Wikipedia was launched

on 15 January 2001 with a party from

2pm-

4pm at

Jimmy Wales' house

(more information)

Note the use of the abbr element to contain the machine readable, ISO8601, date-time format for the start and end times.

Accessibility concerns

Concerns have been expressed[http://www.webstandards.org/2007/04/27/haccessibility/ Web Standards Project, hAccessibility: Abbreviations in Microformats] that, where it occurs, the use of the abbr element (using the so-called [http://microformats.org/wiki/abbr-design-pattern abbr-design-pattern]) in the above manner causes accessibility problems, not least for users of screen readers and aural browsers.[http://microformats.org/wiki/assistive-technology Microformats Wiki: Assistive Technology] The newer [http://microformats.org/wiki/h-event h-event] microformat therefore uses the HTML5 element time instead:

Geo

The Geo microformat is a part of the hCalendar specification, and is often used to include the coordinates of the event's location within an hCalendar.

Attributes

For a full list of attributes, see the [http://microformats.org/wiki/hcalendar-cheatsheet hCalendar cheat-sheet].

Users

Notable organisations and other websites using hCalendar include:

  • Birmingham Town Hall and Symphony Hall[http://www.birmingham.gov.uk/microformats Microformats – Birmingham City Council]
  • Facebook{{cite web|url=http://www.zdnet.com/blog/facebook/facebook-adds-hcalendar-and-hcard-microformats-to-events/266|archive-url=https://web.archive.org/web/20110219130150/http://www.zdnet.com/blog/facebook/facebook-adds-hcalendar-and-hcard-microformats-to-events/266|url-status=dead|archive-date=February 19, 2011|title=Facebook adds hCalendar and hCard microformats to Events|last=Protalinski|first=Emil|date=2011-02-18|publisher=ZDNet|access-date=24 March 2011}}
  • Google (in Google maps[http://googlemapsapi.blogspot.com/2007/06/microformats-in-google-maps.html Official Google Maps API Blog: Microformats in Google Maps] and in Search Engine Results Pages [http://microformats.org/2010/04/28/google-adds-support-for-hcalendar-and-hrecipe-rich-snippets Microformats.org: Google adds support for hCalendar and hRecipe Rich Snippets][https://support.google.com/webmasters/bin/answer.py?hl=en&answer=164506 Google Webmaster Tools: Rich snippets - Events])
  • The Opera web browser website[http://my.opera.com/dstorey/blog/microformats-on-opera-sites David Storey – Microformats on Opera sites]
  • The Radio Times
  • The University of Bath[http://microformats.org/wiki/hcalendar-examples-in-wild hCalendar Examples in the wild · Microformats Wiki]
  • The University of Washington
  • Upcoming.org
  • WikipediaWikipedia:Microformats
  • Yahoo!, on Yahoo! Local

References

{{reflist}}

External links

  • [http://microformats.org/wiki/hcalendar hCalendar at the Microformats Wiki]

{{Semantic Web}}

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Category:Microformats