# RELAX NG Compact Syntax Grammar
# Description: Google Calendar: feed of a calendar's events

namespace atom = "http://www.w3.org/2005/Atom"
namespace gCal = "http://schemas.google.com/gCal/2005"
namespace gd = "http://schemas.google.com/g/2005"
namespace openSearch = "http://a9.com/-/spec/opensearch/1.1/"

start = calendar_calendarEventFeed | calendar_calendarEventEntry


# Describes the status of an event attendee

gdata_attendeeStatus = element gd:attendeeStatus {
    attribute value { xsd:string } }


# Describes an author

atom_author = element atom:author { attribute xml:lang { xsd:string }?, (
    atom_email? &
    atom_name &
    atom_uri? ) }


# Describes an entry in a feed of a Calendar event's comments

calendar_calendarCommentEntry = element atom:entry {
    attribute gd:etag { xsd:string }?,
    ( atom_author* &
    atom_content? &
    atom_contributor* &
    atom_id &
    atom_published? &
    atom_updated &
    calendar_calendarLink+ &
    element atom:title { atom_textConstruct } &
    gdata_messageKind ) }


# Describes feed of a Calendar event's comments

calendar_calendarCommentFeed = element atom:feed {
    attribute gd:etag { xsd:string }?,
    ( atom_author* &
    atom_contributor* &
    atom_generator? &
    atom_id &
    atom_updated &
    calendar_calendarCommentEntry* &
    calendar_calendarLink+ &
    element atom:title { atom_textConstruct } &
    gdata_messageKind &
    opensearch_itemsPerPage? &
    opensearch_startIndex? &
    opensearch_totalResults? ) }


# Describes a container of a feed link for Calendar comment entries

calendar_calendarComments = element gd:comments {
    calendar_calendarCommentsFeedLink }


# Describes a nested Calendar comments feed link

calendar_calendarCommentsFeedLink = element gd:feedLink {
    attribute countHint { xsd:int }?,
    attribute href { xsd:string }?,
    attribute readOnly { xsd:boolean }?,
    attribute rel { xsd:string }?,
    calendar_calendarCommentFeed? }


# Describes a Calendar event entry

calendar_calendarEventEntry = element atom:entry {
    attribute gd:etag { xsd:string }?,
    ( atom_author+ &
    atom_content? &
    atom_contributor* &
    atom_id &
    atom_published? &
    atom_updated &
    calendar_calendarComments? &
    calendar_calendarExtendedProperty* &
    calendar_calendarLink+ &
    calendar_calendarRecurrenceException* &
    calendar_calendarWhere* &
    calendar_calendarWho* &
    calendar_icalUIDProperty? &
    calendar_privateCopyProperty? &
    calendar_quickAddProperty? &
    calendar_sendEventNotificationsProperty? &
    calendar_sequenceNumberProperty? &
    calendar_syncEventProperty? &
    element atom:summary { atom_textConstruct }? &
    element atom:title { atom_textConstruct } &
    gdata_eventKind &
    gdata_eventStatus? &
    gdata_originalEvent? &
    gdata_recurrence? &
    gdata_reminder* &
    gdata_transparency? &
    gdata_visibility? &
    gdata_when* ) }


# Describes a Calendar event feed

calendar_calendarEventFeed = element atom:feed {
    attribute gd:etag { xsd:string }?,
    ( atom_author* &
    atom_contributor* &
    atom_generator? &
    atom_id &
    atom_updated &
    calendar_calendarEventEntry* &
    calendar_calendarLink+ &
    calendar_timeZoneProperty &
    calendar_timesCleanedProperty? &
    element atom:subtitle { atom_textConstruct } &
    element atom:title { atom_textConstruct } &
    gdata_eventKind &
    opensearch_itemsPerPage &
    opensearch_startIndex? &
    opensearch_totalResults? ) }


# Defines a value for the realm attribute that is used only in the calendar API

calendar_calendarExtendedProperty = element gd:extendedProperty {
    attribute name { xsd:string },
    attribute realm { xsd:string }?,
    attribute value { xsd:string }? }


# Extends the base Link class with Calendar extensions

calendar_calendarLink = element atom:link {
    attribute href { xsd:string },
    attribute length { xsd:long }?,
    attribute rel { "alternate" | "edit" |
    "http://schemas.google.com/acl/2007#accessControlList" |
    "http://schemas.google.com/acl/2007#controlledObject" |
    "http://schemas.google.com/g/2005#batch" |
    "http://schemas.google.com/g/2005#feed" |
    "http://schemas.google.com/g/2005#post" |
    "http://schemas.google.com/gCal/2005/webContent" | "next" | "previous" |
    "related" | "self" },
    attribute title { xsd:string }?,
    attribute type { xsd:string },
    calendar_webContent? }


# Describes an exception to a recurring Calendar event

calendar_calendarRecurrenceException = element gd:recurrenceException {
    attribute specialized { xsd:boolean },
    calendar_calendarRecurrenceExceptionEntryLink }


# Describes an entry used by a Calendar recurrence exception entry link

calendar_calendarRecurrenceExceptionEntry = element atom:entry {
    attribute gd:etag { xsd:string }?,
    ( atom_author* &
    atom_category* &
    atom_content? &
    atom_contributor* &
    atom_id &
    atom_published? &
    atom_updated &
    calendar_calendarComments? &
    calendar_calendarLink* &
    calendar_calendarWhere* &
    calendar_calendarWho* &
    calendar_icalUIDProperty? &
    calendar_sequenceNumberProperty? &
    element atom:title { atom_textConstruct } &
    gdata_eventStatus? &
    gdata_originalEvent? &
    gdata_transparency? &
    gdata_visibility? &
    gdata_when* ) }


# Describes an entry link used by a Calendar recurrence exception

calendar_calendarRecurrenceExceptionEntryLink = element gd:entryLink {
    calendar_calendarRecurrenceExceptionEntry? }


# Extends the base Where class with Calendar extensions

calendar_calendarWhere = element gd:where {
    attribute valueString { xsd:string }? }


# Extends the base Who class with Calendar extensions

calendar_calendarWho = element gd:who {
    attribute email { xsd:string }?,
    attribute rel { xsd:string }?,
    attribute valueString { xsd:string }?,
    ( calendar_resourceProperty? &
    gdata_attendeeStatus? ) }


# Describes a category

atom_category = element atom:category {
    attribute label { xsd:string }?,
    attribute scheme { xsd:string }?,
    attribute term { xsd:string },
    attribute xml:lang { xsd:string }? }


# Describes a content

atom_content = element atom:content {
    attribute src { xsd:string }?,
    attribute type { xsd:string }?,
    attribute xml:lang { xsd:string }?,
    xsd:string? }


# Describes a contributor

atom_contributor = element atom:contributor {
    attribute xml:lang { xsd:string }?,
    ( atom_email? &
    atom_name &
    atom_uri? ) }


# Describes an author's email address

atom_email = element atom:email { xsd:string }


# Describes an event kind

gdata_eventKind = element atom:category {
    attribute scheme { "http://schemas.google.com/g/2005#kind" },
    attribute term { "http://schemas.google.com/g/2005#event" } }


# Describes the base set of values for event status

gdata_eventStatus = element gd:eventStatus { attribute value { xsd:string } }


# Describes the generator

atom_generator = element atom:generator {
    attribute uri { xsd:string }?,
    attribute version { xsd:string }?,
    xsd:string }


# Describes the UID in the ical export of the event

calendar_icalUIDProperty = element gCal:uid { attribute value { xsd:string } }


# Describes a unique identifier

atom_id = element atom:id { xsd:string }


# Describes the number of items that will be returned per page for paged feeds

opensearch_itemsPerPage = element openSearch:itemsPerPage { xsd:int }


# Describes a message kind

gdata_messageKind = element atom:category {
    attribute scheme { "http://schemas.google.com/g/2005#kind" },
    attribute term { "http://schemas.google.com/g/2005#message" } }


# Describes an author's human-readable name

atom_name = element atom:name { xsd:string }


# Describes a link to a recurring event

gdata_originalEvent = element gd:originalEvent {
    attribute href { xsd:string },
    attribute id { xsd:string },
    gdata_when }


# Indicates whether this is a private copy of the event, changes to which should
# not be sent to other calendars

calendar_privateCopyProperty = element gCal:privateCopy {
    attribute value { xsd:boolean } }


# Describes a creation timestamp

atom_published = element atom:published { (xsd:date | xsd:dateTime) }


# Describes whether gd:content is for quick-add processing

calendar_quickAddProperty = element gCal:quickadd {
    attribute value { xsd:boolean } }


# Describes an RFC 2445 recurrence rule

gdata_recurrence = element gd:recurrence { xsd:string }


# Describes a reminder on an event

gdata_reminder = element gd:reminder { attribute absoluteTime { (
    xsd:date | xsd:dateTime) }?,
    attribute days { xsd:int }?,
    attribute hours { xsd:int }?,
    attribute method { xsd:string }?,
    attribute minutes { xsd:int }? }


# Describes whether gd:who is a resource such as a conference room

calendar_resourceProperty = element gCal:resource {
    attribute id { xsd:string }?,
    attribute value { xsd:boolean }? }


# Describes whether to send event notifications to other participants of the
# event

calendar_sendEventNotificationsProperty = element gCal:sendEventNotifications {
    attribute value { xsd:boolean } }


# Describes sequence number of an event

calendar_sequenceNumberProperty = element gCal:sequence {
    attribute value { xsd:int } }


# Describes the starting index of the contained entries for paged feeds

opensearch_startIndex = element openSearch:startIndex { xsd:int }


# Describes whether this is a sync scenario where the Ical UID and Sequence
# number are honored during inserts and updates

calendar_syncEventProperty = element gCal:syncEvent {
    attribute value { xsd:boolean } }


# Describes a text construct containing either plain text, HTML, or XHTML

atom_textConstruct = attribute src { xsd:string }?,
    attribute type { xsd:string }?,
    attribute xml:lang { xsd:string }?,
    xsd:string?


# Describes the time zone of a calendar

calendar_timeZoneProperty = element gCal:timezone {
    attribute value { xsd:string } }


# Describes how many times calendar was cleaned via Manage Calendars

calendar_timesCleanedProperty = element gCal:timesCleaned {
    attribute value { xsd:unsignedInt } }


# Describes the total number of results associated with this feed

opensearch_totalResults = element openSearch:totalResults { xsd:int }


# Describes the base set of values for event transparency

gdata_transparency = element gd:transparency { attribute value { xsd:string } }


# Describes a last updated timestamp

atom_updated = element atom:updated { (xsd:date | xsd:dateTime) }


# Describes the URI associated with an author

atom_uri = element atom:uri { xsd:string }


# Describes the base set of values for event visibility

gdata_visibility = element gd:visibility { attribute value { xsd:string } }


# Describes a "web content" extension

calendar_webContent = element gCal:webContent {
    attribute height { xsd:int },
    attribute url { xsd:string },
    attribute width { xsd:int },
    calendar_webContentGadgetPref* }


# Describes a single web content gadget preference

calendar_webContentGadgetPref = element gCal:webContentGadgetPref {
    attribute name { xsd:string },
    attribute value { xsd:string } }


# Describes a period of time

gdata_when = element gd:when { attribute endTime { (
    xsd:date | xsd:dateTime) }?,
    attribute startTime { (xsd:date | xsd:dateTime) },
    attribute valueString { xsd:string }?,
    gdata_reminder* }