[OSM-dev] Timestamp in PBF files
frederik at remote.org
Tue Dec 11 19:39:17 GMT 2012
On 11.12.2012 16:29, Jochen Topf wrote:
> For starters this makes XML and PBF files incompatible which is
> not good.
They are already incompatible with regard to header fields; the XML
files emitted by the API have "copyright", "attribution", and "license"
header fields which PBF doesn't have as far as I can see.
It would be fairly trivial to add the new replication fields to an XML
file if one so desired. Since nobody parses OSM XML with a schema
anyway, unknown attributes would just be ignored.
> Next it has to be figured out what changes to the input data lead to
> changes in the output of these flags. Obviously when you apply a diff
> headers should change, shouldn't they? Those things all have to be
> and implemented properly.
This is not something that has to be implemented in Osmium, but by
whoever uses Osmium to write a program with it. Today, Osmium supports a
"bbox" header, and obviously if I write a program that does spatial
filtering then this header has to change - but that is my responsibility
and Osmium cannot be expected to do anything with that header
automatically. It's exactly the same with the new replication headers.
(And there is much less documentation about what an application
developer is expected to do with the "bbox" and "writingprogram" fields
- and the additional "source" field which is defined in the PBF but not
exposed by Osmium - than there is for the new replication fields, here
Frederik Ramm ## eMail frederik at remote.org ## N49°00'09" E008°23'33"
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