[OSM-dev] Timestamp in PBF files

[marqqs at gmx.eu]

> message HeaderMeta {
>   required string HeaderKey = 1;
>   optional HeaderMetaVarint = 10;
>   optional HeaderMetaString = 12;
> // see type definitions there:
> https://wiki.openstreetmap.org/wiki/PBF#Format_example
> // Only _one_ of the three optional objects should be used; did not know
> how to define this in Protobuf without an additional hierarchy layer.
> }


Sorry, I meant "Only _one_ of the two" - not "tree".