I created a (still very small) table showing some examples for both proposals: http://wiki.openstreetmap.org/wiki/User:Imagic/Werkstatt2
If you have any signposts or can provide a currently missing solution please feel free to update this page or send me the link to the signpost/a description and I'll add it. Martin 2012/6/13 Eckhart Wörner <ewoer...@kde.org>: > Hi everybody, > > I want to revive the discussion on how to tag restrictions that depend on > certain conditions. My idea is to finalize the proposal described in > http://wiki.openstreetmap.org/wiki/Proposed_features/Extended_conditions_for_access_tags > and finally accept it. > > The reasons for picking this proposal: > * The proposal mostly describes syntax that is already used for tagging, e.g. > a maxspeed in a certain direction is almost always tagged as > maxspeed:forward, maxspeed:backward > * The proposal is intuitive and simple to use: the key of a tag is the base > tag + a set of conditions that all have to be true for the key to apply (i.e. > logical AND). > * The proposal is complete: every logical formula of conditions can be > expressed in it (technically, it's pretty similar to disjunctive normal form). > * The proposal is consise: it follows the pattern most dominant with road > restrictions, namely overriding general restrictions with special > restrictions. It normally uses no more than one tag per sign. > * The proposal is extensible: the set of conditions is not fixed and can be > extended to new conditions. It is possible to set a sane default for new > conditions that are experimental. > * The proposal is easily implementable: I implemented it in a prototype > already. > > The only real negative aspect that has been mentioned until now: > * the proposal puts a lot of information into keys and theoretically allows > for an unlimited set of keys. (The reality however shows that those keys tend > to be the same, e.g. taginfo shows no less than 335 elements with key > "maxspeed:(22:00-06:00)"). > > Competing proposals: > * > http://wiki.openstreetmap.org/wiki/Proposed_features/access_restrictions_1.5 > - in my opinion a horrible and incomprehensible syntax with arbitrary > distinctions, taginfo revealed almost no uses (for example, > "maxspeed:hgv:wet" in the Extended Conditions proposal above is > "access:lgv?wet.speed" in the Access Restrictions 1.5 proposal) > > Opinions? > > Eckhart > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > http://lists.openstreetmap.org/listinfo/tagging _______________________________________________ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging
