[OSM-dev] question about node identifiers

[Frank O'Dwyer]

Hi,

I'm trying to import a subset of planet.osm (POIs, i.e. nodes with 
amenity tags) into my own database, and would like to be able to sync 
future updates using planet.osm diffs.

Are the IDs on poi nodes reliable as unique identifiers for the same 
POI? I.e. will future updates to that POI have the same node ID or could 
they have a different one?

If not, is there a better / more reliable way of identifying changes to 
a particular POI node vs. new nodes?

Thanks,
Frank