GTFS-Static Language Agnostic Programmatic Definition

[Carl Hiltbrunner]

Sorry if I double post, I thought I hit post on my last submission, but I haven't seen it on the group.

I was curious if anyone knew about a language agnostic programmatic definition for the GTFS-Static Specification. I know there are a couple projects like the Google TransitFeed that define each text file's field as a Python object for serializing the feed, however this seems a bit clunky, requiring code updates if there is a specification change, and is only usable in Python. Rather than needing to implement each file as a object in a given language, is there some language agnostic programmatic definition that can be used with some ORM to generate classes automatically in whatever language you are using? Let me know if there's something out there that does this already, if it's something that you think would be useful, or if I'm thinking about this the wrong way.

[Nikhil VJ]

Hi Carl,

This is only very slightly in the zone you're talking about, but sharing as you might find it useful; it could be something to work up from 

I've made this CSV that my program uses to make decisions on whether rows containing a value are to be deleted if that value is deleted, and about which tables are involved if a particular id value is to be renamed. I decided to implement this to make room for users to bring in more fields (GTFS can be customized with extra columns and files if the agency needs) without having to change the code.

https://github.com/WRI-Cities/static-GTFS-manager/blob/master/config/deleteRules.csv

I've found this concept quite beneficial as it greatly reduced the code clutter : I do not have to hard-code for each field and table now : one generic function handles, for example, both a stop_id and a fare_id with the same code. So for me this is an implementation of a "programming definition".

Can you point to an existing example of "a language agnostic programmatic definition" in some other field?

Regards

Nikhil VJ

Pune, India

[Devon Barrett]

Hi Carl,

We're using a set of protocol buffer definitions originally based off of https://github.com/StichtingOpenGeo/gtfs-protobuf

Might be what you're looking for.

Best,

Devon

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