The proposed example value for the historic key does not seem reasonable. (nrhp:1231313) I suggest you have a look how the world heritage proposal suggests to handle reference numbers:
http://wiki.openstreetmap.org/wiki/Proposed_features/heritage heritage:operator=* see below. Multiple values can be concatenated using the ; separator, from the highest to the lowest (internationnal, nationnal, regional...) ref:*=* the ref for the operator. In order to keep consistency beetwen all refs, the ref should be tagged ref:* rather than *:ref. cheers, Martin _______________________________________________ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging
