API changes between v0.3 and v0.4
From OpenStreetMap Wiki
- Use '0.4' in the XML and URLs
- Use 'create' instead of '0' to create objects, eg /api/0.4/node/create
- API speaks mime type 'application/xml'
- Get map command will return besides the nodes and segments of the ways within the given bounding box all their nodes and segments lie outside the given bounding box.