Parses one BODS NeTEx fare `.xml` file (DfT fxc profile) into a list of tidy data.tables describing the line, its fare zones, the zone-to-zone price matrix and the fare product.
Value
a list with elements:
- meta
one-row data.table of file / operator / line / product attributes (operator NOC, line public code, direction, currency, product name & type, trip type, user type, validity dates).
- stops
data.table of scheduled stop points (`stop_id` is the ATCO code with the `atco:` prefix removed), with name and locality.
- zones
long data.table mapping each fare `zone_id` to its member `stop_id`s (plus zone name).
- prices
data.table of price bands (`price_group`) and their `amount`.
- fares
data.table of the fare triangle: `from_zone`, `to_zone`, `price_group`, `amount` (one row per origin/destination zone pair).