There are some special codes that one can use to have zoom dependent
length of labels in maps:
"{2" - Non-spacing prefix indicator.
"{3" - Prefix indicator.
"{4" - Non-spacing suffix indicator.
"{5" - Suffix indicator.
So for example we have a road called B51 (from the ref field) and
Streetname (from the name field). Ideally we could now write in the
style-file:
{ set name='{3{$ref}{$name}' } however mkgmap does not correctly enact
this and removes the leading"{" so instead of shortening the name, I end
up with useless "2", "3", "4" and "5" inside the names.
name: Brucker Ersatzstrasse
ref: 335
rule: {name '{3${ref|highway-symbol:oval:6:4}{5${name}' |
'${ref|highway-symbol:oval:6:4}' | '${name}'}
i.e. instead of the following label being encoded like this: {3B335
{5BRUCKER ERSATZSTRASSE
it ends up like this: 3~[0x2f]B335 5BRUCKER ERSATZSTRASSE
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