On Mon, 9 Mar 2015, Martijn van Exel wrote:
If the file is really incomplete, I don't think JOSM should accept it - or at least not without some kind of warning. The current behavior is ambiguous: it loads the file without any warning or error, and merges with another layer just fine, but it does not display the file (because obviously it does not have enough information.) Or is this because the JOSM file format is not well enough defined? There is nothing on the wiki suggesting a JXML file should contain all existing nodes in a way, or what happens if it doesn't. Should I write a clarification?
JOSM can also handle incomplete data sets, where referenced objects are missing. For relations this is obvious. For other types not so much.
Anyway that's a feature. :-) But usually it is not recommended to use that feature unless you really know what you are doing. That's why most suggested XAPI/Overpass/API requests include the referenced objects to reduce trouble, but it works without.
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