<match target="font">
<!-- check to see if the font is just regular -->
<test name="weight" compare="less_eq">
<int>100</int>
</test>
<!-- check to see if the pattern requests bold -->
<test target="pattern" name="weight" compare="more_eq">
<int>180</int>
</test>
<!-- set the embolden flag -->
<edit name="embolden" mode="assign">
<bool>true</bool>
</edit>
</match>