ICalendar

Specification

• http://tools.ietf.org/html/rfc5545
• DRAFT: http://tools.ietf.org/html/draft-daboo-et-al-icalendar-in-xml-11
• obsolete: http://www.ietf.org/rfc/rfc2445.txt

Usage by tango.info

• Tango.info iCal

Validators

• http://severinghaus.org/projects/icv/ - rough check
• http://arnout.engelen.eu/icalendar-validator/urlvalidate - more checks

Parsers

• https://github.com/fruux/sabre-vobject

xCal

Lowercasing:

Each calendar component in the "VCALENDAR" object, delimited by "BEGIN" and "END", will be converted to an enclosing XML element with the same name, but in lowercase.

Each individual iCalendar property is represented in xCal by an element of the same name as the iCalendar property, but in lowercase. For example, the "CALSCALE" property is represented in xCal by the IC:calscale element.