edu.upenn.cis.ptb.xpath
Class SubtreeFunction

java.lang.Object
  edu.upenn.cis.ptb.xpath.SubtreeFunction

All Implemented Interfaces:

org.jaxen.Function

public class SubtreeFunction

extends java.lang.Object

implements org.jaxen.Function

Functional definition of the Subtree Scoping operation in LPath.. This function has the signature:

  node-set subtree(node-set, string)
 

The second argument is a string which should be a valid XPath expression. This expression will be run against each element in the nodeset, pretending as if the tree is rooted at that element. Achieves the subtree scoping effect of LPath (Bird et al). For example:

  subtree(>>=::VP, '>::VB/-->::NN')
 

Within a VP with a VB child, select all the NN nodes which follow this VB. See the PTBXPath class for how to make recursive calls.

Author:

nikhild

See Also:

PTBXPath

Constructor Summary

SubtreeFunction()
Creates a new instance of SubtreeScoping

Method Summary

java.lang.Object

call(org.jaxen.Context context, java.util.List list)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SubtreeFunction

public SubtreeFunction()

Creates a new instance of SubtreeScoping

Method Detail

call

public java.lang.Object call(org.jaxen.Context context,
                             java.util.List list)
                      throws org.jaxen.FunctionCallException

Specified by:

call in interface org.jaxen.Function

Throws:

org.jaxen.FunctionCallException