The Ellogon Pattern Engine: Context-free Grammars over Annotations

  title={The Ellogon Pattern Engine: Context-free Grammars over Annotations},
  author={Georgios Petasis},
This paper presents the pattern engine that is offered by the Ellogon language engineering platform. This pattern engine allows the application of context-free grammars over annotations, which are metadata generated during the processing of documents by natural language tools. In addition, grammar development is aided by a graphical grammar editor, giving grammar authors the capability to test 

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