anomaly: unknown record identifiers `GS` and `GR` in Translink (NI) data set

[davidjrice]

After the work done to track un-parseable lines in #7 examining the example data set (from Translink NI bus timetables that were made available 15 years ago now 🤯)

There appears to be two additional record types in their version of the ATCO-CIF file format.

These do not appear in the ATCO-CIF spec (Version 5.10, included in the docs) or the OpenDataNI dataset on Ulsterbus and Goldliner Timetable Data last updated 8th November 2023. Also it does not adhere to the usage of the Z series of identifiers for proprietary extensions outlaid in the ATCO-CIF spec.

• GS
• GR

This can be seen in the following excerpt from the data set and will be returned in the :unparsed array in the resultant data hash upon parsing a .cif file in the upcoming version including #7.

ATCO-CIF0500Electronic Registration         MIA 4.20.18     20090915113809
QLN700000001433Donegal Square East                             1 
QBN700000001433  333935  373979                                                
GS00001433 N                    Belfast Metro Ops                                 7000
GR00001433Donegall Square East                                                                                7000
QLN700000001627Great Northern Mall                             1 
QBN700000001627  333575  373717                                                

Taking a complete guesstimate these might stand for:

• Gazetteer Service
• Gazetteer Route

They also share some (incomplete) data with the QL and QN record types.

Not sure how worthwhile further investigation is as I can't find an online source of the Translink data set anymore but just leaving this here in case it's useful for posterity.