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  3. [ Specifications  ](/RFC-Specifications/all/)
  4. [ iCalendar (RFC 5545)  ](/RFC-Specifications/iCalendar-RFC-5545/)
  5. 10.1. Normative References 

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#  10.1. Normative References

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[ISO.8601.2004] International Organization for Standardization, "Data elements
and interchange formats -- Information interchange \-- Representation of dates
and times", 2004.

[ISO.9070.1991] International Organization for Standardization, "Information
Technology_SGML Support Facilities -- Registration Procedures for Public Text
Owner Identifiers, Second Edition", April 1991.

[RFC2045] Freed, N. and N. Borenstein, "Multipurpose Internet Mail Extensions
(MIME) Part One: Format of Internet Message Bodies", RFC 2045, November 1996.

[RFC2046] Freed, N. and N. Borenstein, "Multipurpose Internet Mail Extensions
(MIME) Part Two: Media Types", RFC 2046, November 1996.

[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997.

[RFC2368] Hoffman, P., Masinter, L., and J. Zawinski, "The mailto URL scheme",
RFC 2368, July 1998.

[RFC3629] Yergeau, F., "UTF-8, a transformation format of ISO 10646", STD 63,
RFC 3629, November 2003.

[RFC3986] Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform Resource
Identifier (URI): Generic Syntax", STD 66, RFC 3986, January 2005.

[RFC4288] Freed, N. and J. Klensin, "Media Type Specifications and
Registration Procedures", BCP 13, RFC 4288, December 2005.

[RFC4648] Josefsson, S., "The Base16, Base32, and Base64 Data Encodings", RFC
4648, October 2006.

[RFC5234] Crocker, D. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", STD 68, RFC 5234, January 2008.

[RFC5646] Phillips, A., Ed., and M. Davis, Ed., "Tags for Identifying
Languages", BCP 47, RFC 5646, September 2009.

[US-ASCII] American National Standards Institute, "Coded Character Set - 7-bit
American Standard Code for Information Interchange", ANSI X3.4, 1986.

[ Previous article: 10. References  Prev  ](/iCalendar-
RFC-5545/10-references.html) [ Next article: 10.2. Informative References
Next  ](/iCalendar-RFC-5545/10-2-informative-references.html)

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###  Need to test your iCalendar feeds?

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URL, file or text snippet and compare it against the [ RFC 5545 specification
](/RFC-Specifications/iCalendar-RFC-5545/) . We believe we have one of the
best iCalendar validation tools available on the internet. More information
about the validator can be [ found here ](/More-Info/about-the-icalendar-
validator.html) .

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