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PMD provides a very handy method for creating new rules by writing an XPath query. When the XPath query finds a match, a violation is created.
Let's take a simple example: assume we have a Factory class that must be always declared final.
We'd like to report a violation each time a declaration of Factory is not declared final. Consider the following class:
public class a {
  Factory f1;

  void myMethod() {
    Factory f2;
    int a;
The following expression does the magic we need:
  [@Image = 'Factory'] and ..[@Final='false']]
See the <a href="" target="_blank">XPath rule tutorial</a> for more information.
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