Hi Elin,
Thanks for asking. I would follow JGitHub package structure, so basically it would have the following classes:
JOpenStreetMapObject, JOpenStreetMapHTTP, JOpenStreetMap, JOpenStreetMapWay, JOpenStreetMapNode, JOpenStreetMapRelation, JOpenStreetMapChangeset, JOpenStreetMapUser
What do you think?
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Sergio Roberto Charpinel Jr.