# RELAX NG Compact Syntax Grammar
# Description: Google Calendar: read-only feed of a user's calendars

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_calendarFeed | calendar_calendarEntry


# Describes how much a given user may do with an event or calendar

calendar_accessLevelProperty = element gCal:accesslevel {
    attribute value { xsd:string } }


# Describes an author

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


# Describes a Calendar entry in the feed of a user's calendars

calendar_calendarEntry = element atom:entry {
    attribute gd:etag { xsd:string }?,
    ( atom_author* &
    atom_category* &
    atom_contributor* &
    atom_id &
    atom_outOfLineContent? &
    atom_published? &
    atom_updated &
    calendar_accessLevelProperty &
    calendar_calendarLink+ &
    calendar_calendarWhere* &
    calendar_colorProperty &
    calendar_hiddenProperty &
    calendar_overrideNameProperty? &
    calendar_selectedProperty &
    calendar_timeZoneProperty &
    calendar_timesCleanedProperty? &
    element atom:summary { atom_textConstruct }? &
    element atom:title { atom_textConstruct } ) }


# Describes a feed of Calendars

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


# 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? }


# Extends the base Where class with Calendar extensions

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


# 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 the color of a calendar

calendar_colorProperty = element gCal:color {
    attribute value { "#0D7813" | "#1B887A" | "#28754E" | "#29527A" | "#2952A3"
    | "#4A716C" | "#4E5D6C" | "#5229A3" | "#528800" | "#5A6986" | "#6E6E41" |
    "#705770" | "#7A367A" | "#865A5A" | "#88880E" | "#8D6F47" | "#A32929" |
    "#AB8B00" | "#B1365F" | "#B1440E" | "#BE6D00" } }


# 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 the generator

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


# Describes whether a calendar is hidden

calendar_hiddenProperty = element gCal:hidden {
    attribute value { xsd:boolean } }


# 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 an author's human-readable name

atom_name = element atom:name { xsd:string }


# Describes an out of line content

atom_outOfLineContent = element atom:content {
    attribute src { xsd:string },
    attribute type { xsd:string }? }


# Describes the override name property of a calendar

calendar_overrideNameProperty = element gCal:overridename {
    attribute value { xsd:string } }


# Describes a creation timestamp

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


# Describes whether a calendar is selected

calendar_selectedProperty = element gCal:selected {
    attribute value { xsd:boolean } }


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

opensearch_startIndex = element openSearch:startIndex { xsd:int }


# 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 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 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 } }