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Stanford Parser processes raw text in English, Chinese, German, Arabic, and French, and extracts constituency parse trees.

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package edu.stanford.nlp.ling;

/**
 * Something that implements the Label interface can act as a
 * constituent, node, or word label with linguistic attributes.
 * A Label is required to have a "primary" String
 * value() (although this may be null).  This is referred to as
 * its value.
 * 

* Implementations of Label split into two groups with * respect to equality. Classes that extend ValueLabel define equality * solely in terms of String equality of its value (secondary facets may be * present but are ignored for purposes of equality), and have equals and * compareTo defined across all subclasses of ValueLabel. This behavior * should not be changed. Other classes that implement Label define equality only * with their own type and require all fields of the type to be equal. *

* A subclass that extends another Label class should override * the definition of labelFactory(), since the contract for * this method is that it should return a factory for labels of the * exact same object type. * @author Christopher Manning */ public interface Label { /** * Return a String representation of just the "main" value of this label. * * @return the "value" of the label */ public String value(); /** * Set the value for the label (if one is stored). * * @param value - the value for the label */ public void setValue(String value); /** * Return a String representation of the label. For a multipart label, * this will return all parts. The toString() method * causes a label to spill its guts. It should always return an * empty string rather than null if there is no value. * * @return a text representation of the full label contents */ public String toString(); /** * Set the contents of this label to this String * representing the * complete contents of the label. A class implementing label may * throw an UnsupportedOperationException for this * method (only). Typically, this method would do * some appropriate decoding of the string in a way that sets * multiple fields in an inverse of the toString() * method. * * @param labelStr the String that translates into the content of the * label */ public void setFromString(String labelStr); /** * Returns a factory that makes labels of the exact same type as this one. * May return null if no appropriate factory is known. * * @return the LabelFactory for this kind of label */ public LabelFactory labelFactory(); }





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