Refactor example per Tammo's suggestion

git-svn-id: https://svn.apache.org/repos/asf/ode/trunk@1435613 13f79535-47bb-0310-9956-ffa450edef68
Improve example to gracefully handle imporoper use of dsl

git-svn-id: https://svn.apache.org/repos/asf/ode/trunk@1435620 13f79535-47bb-0310-9956-ffa450edef68