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From the wiki, I am proposing this format specifically:<br>
<tt style="background:#EEF;font-size:1em;line-height:1.6" dir="ltr"
class="mw-content-ltr"><bdi style="white-space:nowrap"><a
class="mw-selflink selflink"></a></bdi></tt><br>
(<tt style="background:#EEF;font-size:1em;line-height:1.6" dir="ltr"
class="mw-content-ltr"><bdi style="white-space:nowrap"><a
class="mw-selflink selflink">phone</a></bdi>=<bdi>+<country
code>-<area code>-<local number></bdi></tt>,
following the RFC 3966/<a href="http://en.wikipedia.org/wiki/NANP"
class="extiw" title="wikipedia:NANP">NANP</a> pattern)<br>
<br>
However, convert that to "contact:phone=" instead.<br>
<br>
The reason I like the one with hypens (vs spaces) is that when you
add additional comments in the field as in "+1-800-555-1234
(toll-free)" or use the letters instead of numbers "+1-555-GOT-BEER"
the hypens make it much more clear what is part of the phone number
and what is not.<br>
<br>
<br>
On 2018-02-05 05:02 PM, OSM Volunteer stevea wrote:<br>
<blockquote type="cite"
cite="mid:D0C36422-02D8-4B81-A88C-686A80D2974D@softworkers.com">
<pre wrap="">Hey, a discussion for multi-contact and phone tag semantics-meets-syntax. Excellent!
Note how our tag:phone wiki <a class="moz-txt-link-freetext" href="https://wiki.osm.org/wiki/Key:phone">https://wiki.osm.org/wiki/Key:phone</a> hews pretty strongly to ITU-T E.164. That is a goal to shoot for, as what it calls "user agents" is what I referred to as "a phone number parser." There is some caution ("not voted on just documentation of use") about country-specific usage, should Canada fully embrace something unique.
I can also imagine a "sweeper script" (specific to Canada geographically, if you wish) which does selecting-new-and-possibly-unorthodox phone numbers getting run once in a while, say twice a year, to keep a checking eye on things. That could be a short Overpass Turbo script plus a few minutes of human analysis similar to the sort you (Matthew) are doing now.
Like mowing the lawn, as I think about it. Sure, I had to buy a lawnmower and I even sharpen the blades now and then. So, the task is easy.
SteveA
California</pre>
</blockquote>
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