Data Dictionary

Field Name Name Type Description Fixed Values
header Feed Header FeedHeader Metadata about a feed, included in feed messages. None
header.gtfs_realtime_version GTFS Realtime Version STRING Version of the feed specification. The current version is 2.0. None
header.incrementality Incrementality ENUM

Determines whether the current fetch is incremental. Options include:

-FULL_DATASET: this feed update will overwrite all preceding realtime information for the feed. Thus this update is expected to provide a full snapshot of all known realtime information.

-DIFFERENTIAL: currently, this mode is unsupported and behavior is unspecified for feeds that use this mode. There are discussions on the GTFS Realtime mailing list around fully specifying the behavior of DIFFERENTIAL mode and the documentation will be updated when those discussions are finalized.

 FULL_DATASET, DIFFERENTIAL
header.timestamp Feed Header Timestamp int64 This timestamp identifies the moment when the content of this feed has been created (in server time). In POSIX time (i.e., number of seconds since January 1st 1970 00:00:00 UTC). To avoid time skew between systems producing and consuming realtime information it is strongly advised to derive timestamp from a time server. It is completely acceptable to use Stratum 3 or even lower strata servers since time differences up to a couple of seconds are tolerable. None
entity Feed Entity FeedEntity A definition (or update) of an entity in the transit feed. If the entity is not being deleted, exactly one of trip_update, vehicle, and alert fields should be populated. This field can be repeated as many times as needed. None
entity.id Feed Entity ID STRING Feed-unique identifier for this entity. The ids are used only to provide incrementality support. The actual entities referenced by the feed must be specified by explicit selectors (see EntitySelector below for more info). None
entity.alert Feed Entity Alert Alert An alert, indicating some sort of incident in the public transit network. None
alert.informed_entity Alert Informed Entity EntitySelector Entities whose users we should notify of this alert. At least one informed_entity must be provided. This field can be repeated as many times as needed. None
alert.informed_entity.route_id Alert Informed Entity Route ID STRING The route_id from the GTFS that this selector refers to. If direction_id is provided, route_id must also be provided. None
alert.url Alert URL TranslatedString The URL which provides additional information about the alert. None
alert.url.translation Alert URL Translation Translation A localized string mapped to a language. This field can be repeated as many times as needed. None
alert.url.translation.text Alert URL Translation Text STRING A UTF-8 string containing the message. None
alert.url.translation.language Alert URL Translation Language STRING BCP-47 language code. Can be omitted if the language is unknown or if no internationalization is done at all for the feed. At most one translation is allowed to have an unspecified language tag - if there is more than one translation, the language must be provided. None
alert.header_text Alert Header Text TranslatedString Header for the alert. This plain-text string will be highlighted, for example in boldface. None
alert.header_text.translation Alert Header Text Translation Translation A localized string mapped to a language. This field can be repeated as many times as needed. None
alert.header_text.translation.language Alert Header Text Translation Language STRING BCP-47 language code. Can be omitted if the language is unknown or if no internationalization is done at all for the feed. At most one translation is allowed to have an unspecified language tag - if there is more than one translation, the language must be provided. None
alert.description_text Alert Description Text TranslatedString Description for the alert. This plain-text string will be formatted as the body of the alert (or shown on an explicit "expand" request by the user). The information in the description should add to the information of the header. None
alert.header_text.translation Alert Description Text Translation Translation A localized string mapped to a language. This field can be repeated as many times as needed. None
alert.header_text.translation.text Alert Description Text Translation Text STRING A UTF-8 string containing the message. None
alert.header_text.translation.language Alert Description Text Translation Language STRING BCP-47 language code. Can be omitted if the language is unknown or if no internationalization is done at all for the feed. At most one translation is allowed to have an unspecified language tag - if there is more than one translation, the language must be provided. None

Additional information

Field Value
Format API
License Creative Commons Attribution 4.0
Open Data Title GTFS Realtime - Service Alerts - Yarra Trams
Dataset Security Value BIL1 OFFICIAL - Authorised Public Release
Geographic Coordinate System WGS84
Geographic Coverage Metropolitan Melbourne