Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. vCal is an open source calendar standard for Vision PIM. VCal can export itself to an RSS/RDF/WDP feed or publish itself to the internet using WebDAV and PHP. It can be exported to the iCalendar or vCalendar formats as well. VCal is not to be confused with the better known vCalendar format in that it is a completely different format. Web-based Distributed Authoring and Versioning (WebDAV) is a set of methods based on the Hypertext Transfer Protocol (HTTP) that facilitates collaboration between users in editing and managing documents and files stored on World Wide Web servers. WebDAV was defined in RFC 4918 by a working group of the Internet Engineering Task Force (IETF).

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