HeadWordExtractor (ClearTK TimeML 2.0.0 API)

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java.lang.Object
- org.cleartk.feature.syntax.HeadWordExtractor

All Implemented Interfaces:

FeatureExtractor1<TreebankNode>
```
public class HeadWordExtractor
extends Object
implements FeatureExtractor1<TreebankNode>
```
Copyright (c) 2007-2008, Regents of the University of Colorado
All rights reserved.

Author:

Philipp Wetzler The rules for finding the head word were adapted from the ASSERT system for semantic role labeling. For more information see: http://cemantix.org/ and Shallow Semantic Parsing using Support Vector Machines Sameer S. Pradhan, Wayne Ward, Kadri Hacioglu, James H. Martin, Daniel Jurafsky, in Proceedings of the Human Language Technology Conference/North American chapter of the Association for Computational Linguistics annual meeting (HLT/NAACL-2004), Boston, MA, May 2-7, 2004

Constructor Summary

Constructors
Constructor and Description
`HeadWordExtractor(FeatureExtractor1<TreebankNode> subExtractor)`
`HeadWordExtractor(FeatureExtractor1<TreebankNode> subExtractor, boolean includePPHead)`

Method Summary

Methods
Modifier and Type	Method and Description
`List<Feature>`	`extract(JCas jCas, TreebankNode constituent)` Some feature extractors will require some specific number of annotations that is greater than one.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - HeadWordExtractor
```
public HeadWordExtractor(FeatureExtractor1<TreebankNode> subExtractor)
```
  - HeadWordExtractor
```
public HeadWordExtractor(FeatureExtractor1<TreebankNode> subExtractor,
                 boolean includePPHead)
```
- Method Detail
  - extract
```
public List<Feature> extract(JCas jCas,
                    TreebankNode constituent)
                      throws CleartkExtractorException
```
    Description copied from interface: FeatureExtractor1
    
    Some feature extractors will require some specific number of annotations that is greater than one. Such extractors should not implement this interface.
    
    Specified by:
    
    extract in interface FeatureExtractor1<TreebankNode>
    
    Parameters:
    jCas - the current view of the document.
    constituent - the annotation for which to collect features.
    
    Returns:
    a list of features generated by the extractor for the focus annotation.
    
    Throws:
    
    CleartkExtractorException

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