[Tagging] City Walls and multipolygons in Osmarender

[Seventy 7]

I have been finishing off some of the city walls in York around here:

http://www.openstreetmap.org/?lat=53.96193&lon=-1.08694&zoom=17&layers=B000FTF

The existing walls have been tagged historic=citywalls which render as a thick grey line in Mapnik and don't render at all in Osmarender. This is an undocumented tag as far as I can tell.

The documented (and therefore correct?) tag is barrier=city_wall, which renders as a thin black line and not as documented in the wiki (http://wiki.openstreetmap.org/wiki/Tag:barrier%3Dcity_wall)

I think that the thick grey line is more befitting of a city wall and also allows a path to run on top, as per elsewhere in York, but I'm not sure what I should be using - the "correct" one or the "better" one. I'm using both at the moment. Any suggestions?

I have also tried mapping the Museum Gardens using single ways and multipolygons just to see how well this style of mapping actually works. So where there is a fence or a wall I've used these as the boundaries and not created a separate area. This has worked fine in Mapnik but not at all in Osmarender. In particular, the Yorkshire Museum (building=yes) is made up of a multipolygon of 3 ways and doesn't render. What should I do about this?

Thanks,
Steve


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