1. Introduction ....................................................3 2. Conventions Used in This Document ...............................3 3. Backwards-Compatible Extension Properties .......................3 4. Modifications to Calendar Components ............................4 5. Properties ......................................................5 5.1. NAME Property ..............................................5 5.2. DESCRIPTION Property .......................................6 5.3. UID Property ...............................................7 5.4. LAST-MODIFIED Property .....................................8 5.5. URL Property ...............................................8 5.6. CATEGORIES Property ........................................8 5.7. REFRESH-INTERVAL Property ..................................9 5.8. SOURCE Property ...........................................10 5.9. COLOR Property ............................................10 5.10. IMAGE Property ...........................................11 5.11. CONFERENCE Property ......................................13 6. Property Parameters ............................................14 6.1. DISPLAY Property Parameter ................................14 6.2. EMAIL Property Parameter ..................................15 6.3. FEATURE Property Parameter ................................16 6.4. LABEL Property Parameter ..................................17 7. Security Considerations ........................................18 8. Privacy Considerations .........................................18 9. IANA Considerations ............................................19 9.1. Property Registrations ....................................19 9.2. Parameter Registrations ...................................20 9.3. Property Parameter Value Registries .......................20 10. References ....................................................21 10.1. Normative References .....................................21 10.2. Informative References ...................................22 Acknowledgments ...................................................23 Author's Address ..................................................23

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