# Package org.eclipse.viatra.query.patternlanguage.emf.specification

- Class Summary
  Class | Description
  --- | ---
  GenericEMFPatternPQuery | This is a generic (i.e.
  GenericQuerySpecification | This is a generic query specification for VIATRA Query pattern matchers, for "interpretative" query execution.
  GenericSingleConstraintPQuery | This is a generic (i.e.
  JvmConstantEvaluator | Evaluates an Jvm Constant, based on XbaseInterpreter#featureCall.
  SpecificationBuilder | An instance class to initialize `PBody` instances from `Pattern` definitions.
  XBaseEvaluator | Evaluates an XBase XExpression inside Rete.