There is also a proposal here [1] for a stroke-border attribute which would allow this to be done is one style:

[1] http://trac.mapnik.org/ticket/51

Dane


On Jan 27, 2009, at 3:32 AM, Ed Loach wrote:

Ivo wrote:

minor-roads
          minor-roads-casing
5 000
1 000
☡
([highway] = 'secondary' or [highway] = 'secondary_link') and not ([tunnel]='yes' or [tunnel]='true')
          CSS:
stroke: #a37b48 stroke-dasharray: stroke- linecap: round stroke-linejoin: round stroke-width: 17;


          minor-roads-fill
5 000
1 000
☡
([highway] = 'secondary' or [highway] = 'secondary_link') and not ([tunnel]='yes' or [tunnel]='true')
          CSS:

stroke: #fdbf6f stroke-dasharray: stroke- linecap: round stroke-linejoin: round stroke-width: 14

Where is the difference between "fill" and the "casing"? The conditions are the same, aren't they?

The conditions are the same, but if you look at the Mapnik layer carefully at maximum zoom you will see that secondary roads have very thin lines (the casing) along the sides of the main part (the fill).

Ed (and forgive this horribly formatted reply – can’t work out how to stop Outlook sticking blue lines next to my reply when I want to reply below the original text)
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