On 4/3/17 6:48 PM, Tommy Bruce wrote: > What About a key with 3 modifiers? > We would have to completely redo the tagging schemes, but what if it > was Highway=Tertiary=(Start date)=(End date) > As for how to display features that have a double tag, I think it > would be relatively easy to figure out. i wouldn't use the = sign as a separator more than once. using additional characters (such : ; ,) on the right side of the equal sign can be ok, but may require software work to support. there is precedence for it, e.g.
ref=US 9; US 20 for highways with two route designation. keep in mind that we probably want to use some kind of ISO derived date format so we would want to avoid parsing ambiguities by avoiding special characters that might appear legitimately in a date. also keep in mind that in the OSM database schema, you can only have one tag with a specific name per entity (node/way/relation). so highway can't appear more than once per entity for example. richard -- [email protected] Averill Park Networking - GIS & IT Consulting OpenStreetMap - PostgreSQL - Linux Java - Web Applications - Search
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