Bernhard R. Fischer writes:
Do nodes, ways, and relations share a common pool of IDs (i.e. there is no node which has the same ID as a way), or do those object have separate ID pools (i.e. there may be a node which has the same ID as a way)?

No, their ID is independent, ID numbers carry no relationship between elements: http://wiki.openstreetmap.org/wiki/Elements#Common_attributes
Stephan

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