This rule allows to define some homemade rules with help of an XPath expression.

Issues are created depending on the return value of the XPath expression. If the XPath expression returns:

• a single or list of AST nodes, then a line issue with the given message is created for each node
• a boolean, then a file issue with the given message is created only if the boolean is true
• anything else, no issue is created

Here is an example of an XPath expression to log a issue on each if statement : //ifStatement