# Package net.sourceforge.pmd.lang.rule

- Interface Summary
  Interface | Description
  --- | ---
  ImmutableLanguage | This is a tag interface to indicate that a Rule implementation class does not support changes to it's Language.
  RuleChainVisitor | The RuleChainVisitor understands how to visit an AST for a particular Language.
  RuleViolationFactory | This class handles of producing a Language specific RuleViolation and adding to a Report.

- Class Summary
  Class | Description
  --- | ---
  AbstractDelegateRule | Base class for Rule implementations which delegate to another Rule instance.
  AbstractRule | Basic abstract implementation of all parser-independent methods of the Rule interface.
  AbstractRuleChainVisitor | This is a base class for RuleChainVisitor implementations which extracts interesting nodes from an AST, and lets each Rule visit the nodes it has expressed interest in.
  AbstractRuleViolationFactory |
  MockRule | This is a Rule implementation which can be used in scenarios where an actual functional Rule is not needed.
  ParametricRuleViolation<T extends Node> |
  RuleReference | This class represents a Rule which is a reference to Rule defined in another RuleSet.
  XPathRule | Rule that tries to match an XPath expression against a DOM view of an AST.

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