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The i Calendar object methods can be used to define other calendaring and scheduling operations such a requesting for and replying with free/busy time data.Such a scheduling protocol is defined in the i Calendar Transport-independent Interoperability Protocol (i TIP) defined in [ITIP].This memo defines a MIME content type for exchanging electronic calendaring and scheduling information.

This MIME media type provides a standard content type for capturing calendar event, to-do and journal entry information.

It also can be used to convey free/busy time information.

The content type is suitable as a MIME message entity that can be transferred over MIME based email systems, using HTTP or some other Internet transport.

In addition, the content type is useful as an object for interactions between desktop applications using the operating system clipboard, drag/drop or file systems capabilities.

Table of Contents 1 Introduction.....................................................5 2 Basic Grammar and Conventions....................................6 2.1 Formatting Conventions .......................................7 2.2 Related Memos ................................................8 2.3 International Considerations .................................8 3 Registration Information.........................................8 3.1 Content Type .................................................8 3.2 Parameters ...................................................9 3.3 Content Header Fields .......................................10 3.4 Encoding Considerations .....................................10 3.5 Security Considerations .....................................10 3.6 Interoperability Considerations .............................11 3.7 Applications Which Use This Media Type ......................11 3.8 Additional Information ......................................11 3.9 Magic Numbers ...............................................11 3.10 File Extensions ............................................11 3.11 Contact for Further Information: ...........................12 3.12 Intended Usage .............................................12 3.13 Authors/Change Controllers .................................12 4 i Calendar Object Specification..................................13 4.1 Content Lines ...............................................13 4.1.1 List and Field Separators ................................16 4.1.2 Multiple Values ..........................................16 4.1.3 Binary Content ...........................................16 4.1.4 Character Set ............................................17 4.2 Property Parameters .........................................17 4.2.1 Alternate Text Representation ............................18 4.2.2 Common Name ..............................................19 4.2.3 Calendar User Type .......................................20 4.2.4 Delegators ...............................................20 4.2.5 Delegatees ...............................................21 4.2.6 Directory Entry Reference ................................21 4.2.7 Inline Encoding ..........................................22 4.2.8 Format Type ..............................................23 4.2.9 Free/Busy Time Type ......................................23 4.2.10 Language ................................................24 4.2.11 Group or List Membership ................................25 4.2.12 Participation Status ....................................25 4.2.13 Recurrence Identifier Range .............................27 4.2.14 Alarm Trigger Relationship ..............................27 4.2.15 Relationship Type .......................................28 4.2.16 Participation Role ......................................29 4.2.17 RSVP Expectation ........................................29 4.2.18 Sent By .................................................30 4.2.19 Time Zone Identifier ....................................30 4.2.20 Value Data Types ........................................32 4.3 Property Value Data Types ...................................32 4.3.1 Binary ...................................................33 4.3.2 Boolean ..................................................33 4.3.3 Calendar User Address ....................................34 4.3.4 Date .....................................................34 4.3.5 Date-Time ................................................35 4.3.6 Duration .................................................37 4.3.7 Float ....................................................38 4.3.8 Integer ..................................................38 4.3.9 Period of Time ...........................................39 4.3.10 Recurrence Rule .........................................40 4.3.11 Text ....................................................45 4.3.12 Time ....................................................47 4.3.13 URI .....................................................49 4.3.14 UTC Offset ..............................................49 4.4 i Calendar Object ............................................50 4.5 Property ....................................................51 4.6 Calendar Components .........................................51 4.6.1 Event Component ..........................................52 4.6.2 To-do Component ..........................................55 4.6.3 Journal Component ........................................56 4.6.4 Free/Busy Component ......................................58 4.6.5 Time Zone Component ......................................60 4.6.6 Alarm Component ..........................................67 4.7 Calendar Properties .........................................73 4.7.1 Calendar Scale ...........................................73 4.7.2 Method ...................................................74 4.7.3 Product Identifier .......................................75 4.7.4 Version ..................................................76 4.8 Component Properties ........................................77 4.8.1 Descriptive Component Properties .........................77 4.8.1.1 Attachment ...........................................77 4.8.1.2 Categories ...........................................78 4.8.1.3 Classification .......................................79 4.8.1.4 Comment ..............................................80 4.8.1.5 Description ..........................................81 4.8.1.6 Geographic Position ..................................82 4.8.1.7 Location .............................................84 4.8.1.8 Percent Complete .....................................85 4.8.1.9 Priority .............................................85 4.8.1.10 Resources ...........................................87 4.8.1.11 Status ..............................................88 4.8.1.12 Summary .............................................89 4.8.2 Date and Time Component Properties .......................90 4.8.2.1 Date/Time Completed ..................................90 4.8.2.2 Date/Time End ........................................91 4.8.2.3 Date/Time Due ........................................92 4.8.2.4 Date/Time Start ......................................93 4.8.2.5 Duration .............................................94 4.8.2.6 Free/Busy Time .......................................95 4.8.2.7 Time Transparency ....................................96 4.8.3 Time Zone Component Properties ...........................97 4.8.3.1 Time Zone Identifier .................................97 4.8.3.2 Time Zone Name .......................................98 4.8.3.3 Time Zone Offset From ................................99 4.8.3.4 Time Zone Offset To .................................100 4.8.3.5 Time Zone URL .......................................101 4.8.4 Relationship Component Properties .......................102 4.8.4.1 Attendee ............................................102 4.8.4.2 Contact .............................................104 4.8.4.3 Organizer ...........................................106 4.8.4.4 Recurrence ID .......................................107 4.8.4.5 Related To ..........................................109 4.8.4.6 Uniform Resource Locator ............................110 4.8.4.7 Unique Identifier ...................................111 4.8.5 Recurrence Component Properties .........................112 4.8.5.1 Exception Date/Times ................................112 4.8.5.2 Exception Rule ......................................114 4.8.5.3 Recurrence Date/Times ...............................115 4.8.5.4 Recurrence Rule .....................................117 4.8.6 Alarm Component Properties ..............................126 4.8.6.1 Action ..............................................126 4.8.6.2 Repeat Count ........................................126 4.8.6.3 Trigger .............................................127 4.8.7 Change Management Component Properties ..................129 4.8.7.1 Date/Time Created ...................................129 4.8.7.2 Date/Time Stamp .....................................130 4.8.7.3 Last Modified .......................................131 4.8.7.4 Sequence Number .....................................131 4.8.8 Miscellaneous Component Properties ......................133 4.8.8.1 Non-standard Properties .............................133 4.8.8.2 Request Status ......................................134 5 i Calendar Object Examples......................................136 6 Recommended Practices..........................................140 7 Registration of Content Type Elements..........................141 7.1 Registration of New and Modified i Calendar Object Methods ..141 7.2 Registration of New Properties .............................141 7.2.1 Define the property .....................................142 7.2.2 Post the Property definition ............................143 7.2.3 Allow a comment period ..................................143 7.2.4 Submit the property for approval ........................143 7.3 Property Change Control ....................................143 8 References.....................................................144 9 Acknowledgments................................................145 10 Authors' and Chairs' Addresses................................146 11 Full Copyright Statement......................................148 The use of calendaring and scheduling has grown considerably in the last decade.

Enterprise and inter-enterprise business has become dependent on rapid scheduling of events and actions using this information technology.All numeric and hexadecimal values used in this memo are given in decimal notation.All names of properties, property parameters, enumerated property values and property parameter values are case-insensitive.Status of this Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements.Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Copyright Notice Copyright (C) The Internet Society (1998). Abstract There is a clear need to provide and deploy interoperable calendaring and scheduling services for the Internet.This memo defines the format for specifying i Calendar object methods.

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