[Tagging] Roads with a postal_code each side

[santamariense]

Hello everyone,

There are some cases of roads with a postal_code each side, but there is no
oficial way of mapping them. I would appreciate it if we discuss, vote and
document them on the Wiki.

It seems that the most natural way of mapping them is with
postal_code:left=* and postal_code:right=* . However it is not always easy
to determine the correct side each postal code refers to. Sometimes the
postal code refers to the odd or even side and there is no house number
mapped yet to be used as reference to determine the postal code side.
Therefore, postal_code:[left/right]=* does not always  seem the best option.

In Brazil, there are some cases of postal_code:side:[even/odd]=*. This
approach makes it easy to map when one does not know which side of the road
is even/odd.

I am looking forward to reading your points of views regarding the matter
and to knowing similar cases as well.

Best,
santamariense
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