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Robin Paulson escribió:
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<pre wrap="">2008/6/15 Susanna Björverud <a class="moz-txt-link-rfc2396E" href="mailto:susanna.bjorverud@telia.com"><susanna.bjorverud@telia.com></a>:
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<pre wrap="">Hi,
AFAICT the keys bridge and tunnel do currently not assume any default value
for layer apart from the normal layer=0 that holds for all objects. While it
of course is necessary to be able to specify the layer for both of these
keys, it also seems to me that the "normal" case is that bridge should imply
layer=1 and tunnel layer=-1. The wiki pages for bridge already states "In
the easiest case the bridge gets the tag layer=1" and the one for tunnel "In
the easiest case the tunnel gets the tag layer=-1"
When looking at a new area in JOSM, I as a rule run the validator, and one
of the most frequent (in my totally unscientific, with no statistics to back
it up gut-feeling) "mistakes" that it warns about (crossing ways) is bridges
and tunnels without an accompanying layer tag. If I knew how I would try to
verify this against the database... but alas I do not.
I would therefore like to suggest that if it is possible bridge=yes should
in the absence of a layer tag be interpreted as layer=1 and that tunnel=yes
in the absence of a layer tag should be interpreted as layer=-1, in the same
way as a junction=roundabout implies oneway=yes etc.
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<pre wrap=""><!---->
personally, i would prefer if this were implemented at the editor
level - i.e. when i add a 'bridge = yes' tag, it also adds a 'layer=1'
tag as well, so i can either accept, or occasionally change it. where
possible, and appropriate, i would prefer things like this be in the
open
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i personally back Robin Paulson opinion, if something is to change is
that when you put the brige=yes tag automatically the layer=1 tag
appears and then manually change the value if it´s not the case, same
for tunnel and layer -1. this can be implemented as a preset setting
tag in potlach and JOSM.<br>
<br>
if it´s assumed that abscence of layer is other than 0 wich is default
(and a simple rule). then is going to be some confussion because
different values of layer are going to be defined with no feedback to
know.<br>
<br>
sergio<br>
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