mapnik/tests/visual_tests/styles/text-spacing.xml

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs" background-color="rgb(255,100,100)">
    <Parameters>
        <Parameter name="sizes">512,512</Parameter>
    </Parameters>
    <Style name="road">
        <Rule>
            <LineSymbolizer stroke="rgb(255,255,255)" stroke-width="12" stroke-linejoin="round" stroke-linecap="round"/>
        </Rule>
        <Rule>
            <TextSymbolizer placement="line" label-position-tolerance="5" spacing="80" face-name="DejaVu Sans Book" halo-radius="1" halo-fill="rgb(255,255,0)">[NAME]</TextSymbolizer>
        </Rule>
    </Style>
    <Layer name="road" srs="+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs">
        <StyleName>road</StyleName>
        <Datasource>
            <Parameter name="file">../data/textspacing</Parameter>
            <Parameter name="type">shape</Parameter>
        </Datasource>
    </Layer>
</Map>