mapnik/tests/visual_tests/styles/hb-fontsets.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE Map>
<Map background-color="white" srs="+proj=latlong +datum=WGS84" font-directory="../fonts">
    <Layer name="layer" srs="+proj=latlong +datum=WGS84">
            <StyleName>My Style</StyleName>
            <Datasource>
                <Parameter name="type">osm</Parameter>
                <Parameter name="file">../data/points.osm</Parameter>
            </Datasource>
    </Layer>

    <FontSet name="dejavu-first">
        <Font face-name="DejaVu Sans Book" />
        <Font face-name="Khmer OS Regular" />
    </FontSet>

    <FontSet name="khmeros-first">
        <Font face-name="Khmer OS Regular" />
        <Font face-name="DejaVu Sans Book" />
    </FontSet>


    <Style name="My Style">
        <Rule>
            <Filter>[nr] = "2"</Filter>
            <TextSymbolizer face-name="Khmer OS Regular" size="36" placement="point" dy="-16">"A:ស្ត្រី"</TextSymbolizer>
            <TextSymbolizer face-name="DejaVu Sans Book" size="9" placement="point" dy="16">"Khmer OS Regular"</TextSymbolizer>
        </Rule>
        <Rule>
            <Filter>[nr] = "4"</Filter>
            <TextSymbolizer face-name="DejaVu Sans Book" size="36" placement="point" dy="-16">"B:ស្ត្រី"</TextSymbolizer>
            <TextSymbolizer face-name="DejaVu Sans Book" size="9" placement="point" dy="16">"DejaVu Sans Book"</TextSymbolizer>
        </Rule>
        <Rule>
            <Filter>[nr] = "6"</Filter>
            <TextSymbolizer fontset-name="dejavu-first" size="36" placement="point" dy="-16">"C:ស្ត្រី"</TextSymbolizer>
            <TextSymbolizer face-name="DejaVu Sans Book" size="9" placement="point" dy="16">"FontSet: DejaVu first"</TextSymbolizer>
        </Rule>
        <Rule>
            <Filter>[nr] = "8"</Filter>
            <TextSymbolizer fontset-name="khmeros-first" size="36" placement="point" dy="-16">"D:ស្ត្រី"</TextSymbolizer>
            <TextSymbolizer face-name="DejaVu Sans Book" size="9" placement="point" dy="16">"FontSet: Khmer OS first"</TextSymbolizer>
        </Rule>
    </Style>
</Map>