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[mkgmap-dev] Cutting down the default style

From Steve Ratcliffe steve at parabola.me.uk on Thu Nov 10 15:08:47 GMT 2011

> What if we extend the mkgmap style language with an 'import' or
> 'include' directive familiar from other languages? There already is the
> base-style directive (used in resources/styles/marine/info), but it
> allows a style to import only one other style.

There is no real reason why it should be restricted to one. Attached
patch fixes that.

If you have a style "c" which has

base-style: a
base-style: b

Then style c will pull in the rules from a and b, so that rules
in c will come first, followed by those in b and then those in a.

They are in reverse order because the rule that matches is first is
the one that gets picked and we want c to override b and b to override a.

Both a and b can have their own base-style options and so on, as now.

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