This rule allows the definition of custom rules using XPath expressions.


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 an issue on each 'td' tag using the 'nowrap' deprecated attribute:

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//td[@nowrap]
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