Details
Description
Rename the rule: "XPath rule".
Document the rule by adding the table on the documentation page: http://docs.codehaus.org/display/SONAR/XML+Plugin.
Rename the parameter: expression => xpathQuery.
The filePattern should follow the same pattern syntax as the Sonar Exclusions one.
Basically I mean that the confluence wiki page on Codehaus is great, but that's not the place where to this kind of documentation in my opinion.
It's great to list the available features, explain how to get started, but I should not have to leave Sonar, open the Wiki page, to understand how a rule works.