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# RELAX NG Schema for iCalendar in XML
# Extract from RFC6321.
# Erratum 3042 applied.
# Erratum 3050 applied.
# Erratum 3314 applied.

default namespace = "urn:ietf:params:xml:ns:icalendar-2.0"

# 3.2 Property Parameters

# 3.2.1 Alternate Text Representation

altrepparam = element altrep {
    value-uri
}

# 3.2.2 Common Name

cnparam = element cn {
    value-text
}

# 3.2.3 Calendar User Type

cutypeparam = element cutype {
    element text {
        "INDIVIDUAL" |
        "GROUP" |
        "RESOURCE" |
        "ROOM" |
        "UNKNOWN"
    }
}

# 3.2.4 Delegators

delfromparam = element delegated-from {
    value-cal-address+
}

# 3.2.5 Delegatees

deltoparam = element delegated-to {
    value-cal-address+
}

# 3.2.6 Directory Entry Reference

dirparam = element dir {
    value-uri
}

# 3.2.7 Inline Encoding

encodingparam = element encoding {
    element text {
        "8BIT" |
        "BASE64"
    }
}

# 3.2.8 Format Type

fmttypeparam = element fmttype {
    value-text
}

# 3.2.9 Free/Busy Time Type

fbtypeparam = element fbtype {
    element text {
        "FREE" |
        "BUSY" |
        "BUSY-UNAVAILABLE" |
        "BUSY-TENTATIVE"
    }
}

# 3.2.10 Language

languageparam = element language {
    value-text
}

# 3.2.11 Group or List Membership

memberparam = element member {
    value-cal-address+
}

# 3.2.12 Participation Status

partstatparam = element partstat {
    type-partstat-event |
    type-partstat-todo |
    type-partstat-jour
}

type-partstat-event = (
    element text {
        "NEEDS-ACTION" |
        "ACCEPTED" |
        "DECLINED" |
        "TENTATIVE" |
        "DELEGATED"
    }
)

type-partstat-todo = (
    element text {
        "NEEDS-ACTION" |
        "ACCEPTED" |
        "DECLINED" |
        "TENTATIVE" |
        "DELEGATED" |
        "COMPLETED" |
        "IN-PROCESS"
    }
)

type-partstat-jour = (
    element text {
        "NEEDS-ACTION" |
        "ACCEPTED" |
        "DECLINED"
    }
)

# 3.2.13 Recurrence Identifier Range

rangeparam = element range {
    element text {
        "THISANDFUTURE"
    }
}

# 3.2.14 Alarm Trigger Relationship

trigrelparam = element related {
    element text {
        "START" |
        "END"
    }
}

# 3.2.15 Relationship Type

reltypeparam = element reltype {
    element text {
        "PARENT" |
        "CHILD" |
        "SIBLING"
    }
}

# 3.2.16 Participation Role

roleparam = element role {
    element text {
        "CHAIR" |
        "REQ-PARTICIPANT" |
        "OPT-PARTICIPANT" |
        "NON-PARTICIPANT"
    }
}

# 3.2.17 RSVP Expectation

rsvpparam = element rsvp {
    value-boolean
}

# 3.2.18 Sent By

sentbyparam = element sent-by {
    value-cal-address
}

# 3.2.19 Time Zone Identifier

tzidparam = element tzid {
    value-text
}

# 3.3 Property Value Data Types

# 3.3.1 BINARY

value-binary =  element binary {
    xsd:string
}

# 3.3.2 BOOLEAN

value-boolean = element boolean {
    xsd:boolean
}

# 3.3.3 CAL-ADDRESS

value-cal-address = element cal-address {
    xsd:anyURI
}

# 3.3.4 DATE

pattern-date = xsd:string {
    pattern = "\d\d\d\d-\d\d-\d\d"
}

value-date = element date {
    pattern-date
}

# 3.3.5 DATE-TIME

pattern-date-time = xsd:string {
    pattern = "\d\d\d\d-\d\d-\d\dT\d\d:\d\d:\d\dZ?"
}

value-date-time = element date-time {
    pattern-date-time
}

# 3.3.6 DURATION

pattern-duration = xsd:string {
    pattern = "(+|-)?P(\d+W)|(\d+D)?"
            ~ "(T(\d+H(\d+M)?(\d+S)?)|"
            ~   "(\d+M(\d+S)?)|"
            ~   "(\d+S))?"
}

value-duration = element duration {
    pattern-duration
}

# 3.3.7 FLOAT

value-float = element float {
    xsd:float
}

# 3.3.8 INTEGER

value-integer = element integer {
    xsd:integer
}

# 3.3.9 PERIOD

value-period = element period {
    element start {
        pattern-date-time
    },
    (
        element end {
            pattern-date-time
        } |
        element duration {
            pattern-duration
        }
    )
}

# 3.3.10 RECUR

value-recur = element recur {
    type-freq,
    (type-until | type-count)?,
    element interval {
        xsd:positiveInteger
    }?,
    type-bysecond*,
    type-byminute*,
    type-byhour*,
    type-byday*,
    type-bymonthday*,
    type-byyearday*,
    type-byweekno*,
    type-bymonth*,
    type-bysetpos*,
    element wkst { type-weekday }?
}

type-freq = element freq {
    "SECONDLY" |
    "MINUTELY" |
    "HOURLY"   |
    "DAILY"    |
    "WEEKLY"   |
    "MONTHLY"  |
    "YEARLY"
}

type-until = element until {
    type-date |
    type-date-time
}

type-count = element count {
    xsd:positiveInteger
}

type-bysecond = element bysecond {
    xsd:nonNegativeInteger
}

type-byminute = element byminute {
    xsd:nonNegativeInteger
}

type-byhour = element byhour {
    xsd:nonNegativeInteger
}

type-weekday = (
    "SU" |
    "MO" |
    "TU" |
    "WE" |
    "TH" |
    "FR" |
    "SA"
)

type-byday = element byday {
    xsd:integer?,
    type-weekday
}

type-bymonthday = element bymonthday {
    xsd:integer
}

type-byyearday = element byyearday {
    xsd:integer
}

type-byweekno = element byweekno {
    xsd:integer
}

type-bymonth = element bymonth {
    xsd:positiveInteger
}

type-bysetpos = element bysetpos {
    xsd:integer
}

# 3.3.11 TEXT

value-text = element text {
    xsd:string
}

# 3.3.12 TIME

pattern-time = xsd:string {
    pattern = "\d\d:\d\d:\d\dZ?"
}

value-time = element time {
    pattern-time
}

# 3.3.13 URI

value-uri = element uri {
    xsd:anyURI
}

# 3.3.14 UTC-OFFSET

value-utc-offset = element utc-offset {
    xsd:string { pattern = "(+|-)\d\d:\d\d(:\d\d)?" }
}

# UNKNOWN

value-unknown = element unknown {
    xsd:string
}

# 3.4 iCalendar Stream

start = element icalendar {
    vcalendar+
}

# 3.6 Calendar Components

vcalendar = element vcalendar {
    type-calprops,
    type-component
}

type-calprops = element properties {
    property-prodid &
    property-version &
    property-calscale? &
    property-method?
}

type-component = element components {
    (
        component-vevent |
        component-vtodo |
        component-vjournal |
        component-vfreebusy |
        component-vtimezone
    )*
}

# 3.6.1 Event Component

component-vevent = element vevent {
    type-eventprop,
    element components {
        component-valarm+
    }?
}

type-eventprop = element properties {
    property-dtstamp &
    property-dtstart &
    property-uid &

property-class? &
    property-created? &
    property-description? &
    property-geo? &
    property-last-mod? &
    property-location? &
    property-organizer? &
    property-priority? &
    property-seq? &
    property-status-event? &
    property-summary? &
    property-transp? &
    property-url? &
    property-recurid? &

property-rrule? &

(property-dtend | property-duration)? &

property-attach* &
    property-attendee* &
    property-categories* &
    property-comment* &
    property-contact* &
    property-exdate* &
    property-rstatus* &
    property-related* &
    property-resources* &
    property-rdate*
}

# 3.6.2 To-do Component

component-vtodo = element vtodo {
    type-todoprop,
    element components {
        component-valarm+
    }?
}

type-todoprop = element properties {
    property-dtstamp &
    property-uid &

property-class? &
    property-completed? &
    property-created? &
    property-description? &
    property-geo? &
    property-last-mod? &
    property-location? &
    property-organizer? &
    property-percent? &
    property-priority? &
    property-recurid? &
    property-seq? &
    property-status-todo? &
    property-summary? &
    property-url? &

property-rrule? &

(
        (property-dtstart?, property-dtend? ) |
        (property-dtstart, property-duration)?
    ) &

# 3.6.3 Journal Component

component-vjournal = element vjournal {
    type-jourprop
}

type-jourprop = element properties {
    property-dtstamp &
    property-uid &

property-class? &
    property-created? &
    property-dtstart? &
    property-last-mod? &
    property-organizer? &
    property-recurid? &
    property-seq? &
    property-status-jour? &
    property-summary? &
    property-url? &

property-rrule? &

property-attach* &
    property-attendee* &
    property-categories* &
    property-comment* &
    property-contact* &
    property-description? &
    property-exdate* &
    property-related* &
    property-rdate* &
    property-rstatus*
}

# 3.6.4 Free/Busy Component

component-vfreebusy = element vfreebusy {
    type-fbprop
}

type-fbprop = element properties {
    property-dtstamp &
    property-uid &

property-contact? &
    property-dtstart? &
    property-dtend? &
    property-duration? &
    property-organizer? &
    property-url? &

property-attendee* &
    property-comment* &
    property-freebusy* &
    property-rstatus*
}

# 3.6.5 Time Zone Component

component-vtimezone = element vtimezone {
    element properties {
        property-tzid &

property-last-mod? &
        property-tzurl?
    },
    element components {
        (component-standard | component-daylight) &
        component-standard* &
        component-daylight*
    }
}

component-standard = element standard {
    type-tzprop
}

component-daylight = element daylight {
    type-tzprop
}

type-tzprop = element properties {
    property-dtstart &
    property-tzoffsetto &
    property-tzoffsetfrom &

property-rrule? &

property-comment* &
    property-rdate* &
    property-tzname*
}

# 3.6.6 Alarm Component

component-valarm = element valarm {
    type-audioprop | type-dispprop | type-emailprop
}

type-audioprop = element properties {
    property-action &

property-trigger &

(property-duration, property-repeat)? &

property-attach?
}

type-emailprop = element properties {
    property-action &
    property-description &
    property-trigger &
    property-summary &

property-attendee+ &

(property-duration, property-repeat)? &

property-attach*
}

type-dispprop = element properties {
    property-action &
    property-description &
    property-trigger &

(property-duration, property-repeat)?
}

# 3.7 Calendar Properties

# 3.7.1 Calendar Scale

property-calscale = element calscale {

element parameters { empty }?,

element text { "GREGORIAN" }
}

# 3.7.2 Method

property-method = element method {

element parameters { empty }?,

value-text
}

# 3.7.3 Product Identifier

property-prodid = element prodid {

element parameters { empty }?,

value-text
}

# 3.7.4 Version

property-version = element version {

element parameters { empty }?,

element text { "2.0" }
}

# 3.8 Component Properties

# 3.8.1 Descriptive Component Properties

# 3.8.1.1 Attachment

property-attach = element attach {

element parameters {
        fmttypeparam? &
        encodingparam?
    }?,

value-uri | value-binary
}

# 3.8.1.2 Categories

property-categories = element categories {

element parameters {
        languageparam? &
    }?,

value-text+
}

# 3.8.1.3 Classification

property-class = element class {

element parameters { empty }?,

element text {
        "PUBLIC" |
        "PRIVATE" |
        "CONFIDENTIAL"
    }
}

# 3.8.1.4 Comment

property-comment = element comment {

element parameters {
        altrepparam? &
        languageparam?
    }?,

value-text
}

# 3.8.1.5 Description

property-description = element description {

element parameters {
        altrepparam? &
        languageparam?
    }?,

value-text
}

# 3.8.1.6 Geographic Position

property-geo = element geo {

element parameters { empty }?,

element latitude  { xsd:float },
    element longitude { xsd:float }
}

# 3.8.1.7 Location

property-location = element location {

element parameters {

altrepparam? &
        languageparam?
    }?,

value-text
}

# 3.8.1.8 Percent Complete

property-percent = element percent-complete {

element parameters { empty }?,

value-integer
}

# 3.8.1.9 Priority

property-priority = element priority {

element parameters { empty }?,

value-integer
}

# 3.8.1.10 Resources

property-resources = element resources {

element parameters {
        altrepparam? &
        languageparam?
    }?,

value-text+
}

# 3.8.1.11 Status

property-status-event = element status {

element parameters { empty }?,

element text {
        "TENTATIVE" |
        "CONFIRMED" |
        "CANCELLED"
    }
}

property-status-todo = element status {

element parameters { empty }?,

element text {
        "NEEDS-ACTION" |
        "COMPLETED" |
        "IN-PROCESS" |
        "CANCELLED"
    }
}

property-status-jour = element status {

element parameters { empty }?,

element text {
        "DRAFT" |
        "FINAL" |
        "CANCELLED"
    }
}

# 3.8.1.12 Summary

property-summary = element summary {

element parameters {
        altrepparam? &
        languageparam?
    }?,

value-text
}

# 3.8.2 Date and Time Component Properties

# 3.8.2.1 Date/Time Completed

property-completed = element completed {

element parameters { empty }?,

value-date-time
}

# 3.8.2.2 Date/Time End

property-dtend = element dtend {

element parameters {
        tzidparam?
    }?,

value-date-time |
    value-date
}

# 3.8.2.3 Date/Time Due

property-due = element due {

element parameters {
        tzidparam?
    }?,

value-date-time |
    value-date
}

# 3.8.2.4 Date/Time Start

property-dtstart = element dtstart {

element parameters {
        tzidparam?
    }?,

value-date-time |
    value-date
}

# 3.8.2.5 Duration

property-duration = element duration {

element parameters { empty }?,

value-duration
}

# 3.8.2.6 Free/Busy Time

property-freebusy = element freebusy {

element parameters {
        fbtypeparam?
    }?,

value-period+
}

# 3.8.2.7 Time Transparency

property-transp = element transp {

element parameters { empty }?,

element text {
        "OPAQUE" |
        "TRANSPARENT"
    }
}

# 3.8.3 Time Zone Component Properties

# 3.8.3.1 Time Zone Identifier

property-tzid = element tzid {

element parameters { empty }?,

value-text
}

# 3.8.3.2 Time Zone Name

property-tzname = element tzname {

element parameters {
        languageparam?
    }?,

value-text
}

# 3.8.3.3 Time Zone Offset From

property-tzoffsetfrom = element tzoffsetfrom {

element parameters { empty }?,

value-utc-offset
}

# 3.8.3.4 Time Zone Offset To

property-tzoffsetto = element tzoffsetto {

element parameters { empty }?,

value-utc-offset
}

# 3.8.3.5 Time Zone URL

property-tzurl = element tzurl {

element parameters { empty }?,

value-uri
}

# 3.8.4 Relationship Component Properties

# 3.8.4.1 Attendee

property-attendee = element attendee {

element parameters {
        cutypeparam? &
        memberparam? &
        roleparam? &
        partstatparam? &
        rsvpparam? &
        deltoparam? &
        delfromparam? &
        sentbyparam? &
        cnparam? &
        dirparam? &
        languageparam?
    }?,

value-cal-address
}

# 3.8.4.2 Contact

property-contact = element contact {

element parameters {
        altrepparam? &
        languageparam?
    }?,

value-text
}

# 3.8.4.3 Organizer

property-organizer = element organizer {

element parameters {
        cnparam? &
        dirparam? &
        sentbyparam? &
        languageparam?
    }?,

value-cal-address
}

# 3.8.4.4 Recurrence ID

property-recurid = element recurrence-id {

element parameters {
        tzidparam? &
        rangeparam?
    }?,

value-date-time |
    value-date
}

# 3.8.4.5 Related-To

property-related = element related-to {

element parameters {
        reltypeparam?
    }?,

value-text
}

# 3.8.4.6 Uniform Resource Locator

property-url = element url {

element parameters { empty }?,

value-uri
}

# 3.8.4.7 Unique Identifier

property-uid = element uid {

element parameters { empty }?,

value-text
}

# 3.8.5 Recurrence Component Properties

# 3.8.5.1 Exception Date/Times

property-exdate = element exdate {

element parameters {
        tzidparam?
    }?,

value-date-time+ |
    value-date+
}

# 3.8.5.2 Recurrence Date/Times

property-rdate = element rdate {

element parameters {
        tzidparam?
    }?,

value-date-time+ |
    value-date+ |
    value-period+
}

# 3.8.5.3 Recurrence Rule

property-rrule = element rrule {

element parameters { empty }?,

value-recur
}

# 3.8.6 Alarm Component Properties

# 3.8.6.1 Action

property-action = element action {

element parameters { empty }?,

element text {
        "AUDIO" |
        "DISPLAY" |
        "EMAIL"
    }
}

# 3.8.6.2 Repeat Count

property-repeat = element repeat {

element parameters { empty }?,

value-integer
}

# 3.8.6.3 Trigger

property-trigger = element trigger {

(
        element parameters {
            trigrelparam?
        }?,

value-duration
    ) |
    (
        element parameters { empty }?,

value-date-time
    )
}

# 3.8.7 Change Management Component Properties

# 3.8.7.1 Date/Time Created

property-created = element created {

element parameters { empty }?,

value-date-time
}

# 3.8.7.2 Date/Time Stamp

property-dtstamp = element dtstamp {

element parameters { empty }?,

value-date-time
}

# 3.8.7.3 Last Modified

property-last-mod = element last-modified {

element parameters { empty }?,

value-date-time
}

# 3.8.7.4 Sequence Number

property-seq = element sequence {

element parameters { empty }?,

value-integer
}

# 3.8.8 Miscellaneous Component Properties

# 3.8.8.3 Request Status

property-rstatus = element request-status {

element parameters {
        languageparam?
    }?,

element code { xsd:string },
    element description { xsd:string },
    element data { xsd:string }?
}

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