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I'm pretty sure at #Transpo camp the fellow from ART mentioned that "we're lucky that our real time prediction provider decided to support GTFS-Realtime". While i think it's great that they support it, it's more or less by luck.
Here's the scoop. There are two standards. SIRI and GTFS-Realtime. Both are fairly new (the folks at nyc told us they modified SIRI by "Breaking" it to provide more functionality, which is what a lot of the early adopters in europe were looking to do).
GTFS-Realtime is geared towards a complete snapshot model. Developers would subscribe to the snapshot and individual requests would go to the developers.
SIRI is more of the standard API model. Query on each stop just like the WMATA or Nextbus API works.
Honestly, providing both standards and letting the developers decide which one works for them with the same data source would be a bit more work, but will pay off in the long run.
Just realize that the standards have been in the works for years, but when the WMATA Api came out, there was no clear standard and GTFS-Realtime was just a twinkle in a researcher's eye at the time.

by RC on Jan 18, 2013 3:50 pm • linkreport

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