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The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119].

The Augmented BNF (ABNF) syntax used by this document to specify the format definition of new iCalendar elements is defined in [RFC5234].

The ABNF syntax used by this document to specify the format definition of new message header fields to be used with the HTTP/1.1 protocol is described in Section 2.1 of [RFC2616]. Since this Augmented BNF uses the basic production rules provided in Section 2.2 of [RFC2616], these rules apply to this document as well.

The term "protected" is used in the Conformance field of WebDAV property definitions as defined in Section 15 of [RFC4918].

Calendaring and scheduling roles are referred to in quoted-strings of text with the first character of each word in uppercase. For example, "Organizer" refers to a role of a calendar user within the scheduling protocol defined by [RFC5546].

This document was automatically converted to XHTML using an RFC to HTML converter with the original text document at the Internet Engineering Task Force web site at .  The original text document should be referred to if there are any errors or discrepancies found in this document.

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The iCalendar Validator provides developers and testers a method to validate their iCalendar feeds, which can take data from either a URL, file or text snippet and compare it against the RFC 5545 specification.  We believe we have one of the best iCalendar validation tools available on the internet. More information about the validator can be found here.