[OSM-dev] Mapnik : any way of controlling the frequency text is written on polylines?

[Nick Whitelegg]

Hello Artem (and all),

I'm trying to get heights to appear on contours, e.g. at:

http://nick.dev.openstreetmap.org/mapnik2/100455105.png

However, the height labelling only appears infrequently. At a guess it 
only places text along a sufficiently straight section of line. The XML 
code is:

<Rule>
<TextSymbolizer name="height" face_name="Bitstream Vera Sans Roman" 
size="8" fill="#fb9b67" halo_radius="0" placement="line"/>
</Rule>

Is there a parameter I can set to increase the frequency of text placement 
along the contour lines?

Thanks,
Nick