I'd like to set maxspeed to the minimum of maxspeed, maxspeed:forward,
and maxspeed:backward.
In my lines file, I use:
|maxspeed:forward=*& maxspeed!=* { set maxspeed='${maxspeed:forward}' }
maxspeed:forward=*& (maxspeed:forward<maxspeed) { set
maxspeed='${maxspeed:forward}' }
maxspeed:backward=*& maxspeed!=* { set maxspeed='${maxspeed:backward}' }
maxspeed:backward=*& (maxspeed:backward<maxspeed) { set
maxspeed='${maxspeed:backward}' }|
That works only if exactly one tag is set. But when both forward and
backward are available, I get the value of forward even if backward is
less. An example is wayhttp://www.openstreetmap.org/browse/way/70594951.
I played with additional / different rules, and my conclusion is that it
is NOT POSSIBLE to compare the values of two tags with each other.
For example, I tried:
|highway=*& maxspeed!=* { set maxspeed=999 }
maxspeed:forward=*& (maxspeed:forward<maxspeed) { set
maxspeed='${maxspeed:forward}' }
maxspeed:backward=*& (maxspeed:backward<maxspeed) { set
maxspeed='${maxspeed:backward}' }|
And you can guess the result: maxspeed=999, for that way with
maxspeed:forward=60 and maxspeed:backward=40.
Is my conclusion correct?
And, if so, will there be a patch?
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