A fundamental choice is whether we fix this in the Key domain or in the Value domain.
Personally I tend towards the Key domain, as there are too many issues with "semicolon syntax" which compromise its suitability for the longer term. For example, the maximum length is going to be a problem sooner or later, and the low appetite for defining an "escape" mechanism to allow the delimiter to be included in the data itself. Also its extensibility towards "data structures" is much less obvious than a key-based solution. Excluding the argument that "that's the way it is now, why change", are there any arguments in favour of a value-based approach? If we were looking at this problem as if we were designing OSM on a clean whiteboard, what reasons are there to say that that the "multivalued keys" problem is best addressed in the Value domain? --colin
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