Validating RELAX NG

% java -jar /usr/local/jing/bin/jing.jar \
?  meerkat.rng meerkat.xml
% java -jar /usr/local/jing/bin/jing.jar -c \
?  meerkat.rnc meerkat.xml

Techquila offers stylesheets that produce DocBook and SVG documentation from RNG.