Not at all, there's plenty of these:
ls -1 pdk/examples/*-plugin.xml
db-mailhost-plugin.xml
directory-tree-plugin.xml
hq-inventory-plugin.xml
hq-plugin-deployer-plugin.xml
io-device-plugin.xml
jboss-entity-container-plugin.xml
jboss-tomcat-string-cache-plugin.xml
...
What went wrong exactly?