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Kaflib-naf is a java library to create and edit NAF documents.

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package ixa.kaflib;

import ixa.kaflib.KAFDocument.AnnotationType;
import ixa.kaflib.KAFDocument.Utils;

import java.util.HashMap;
import java.util.List;
import java.util.ArrayList;
import java.util.Map;


public class NonTerminal extends TreeNode implements SentenceLevelAnnotation {

    /** Label */
    private String label;

    /** Nodes' children */
    private List children;


    NonTerminal(String id, String label) {
	super(id, false, false);
	this.label = label;
	this.children = new ArrayList();
    }

    public String getLabel() {
	return this.label;
    }

    public void setLabel(String label) {
	this.label = label;
    }

    public void addChild(TreeNode tn) throws Exception {
	this.children.add(tn);
    }

    public List getChildren() {
	return this.children;
    }
    
    Map> getReferencedAnnotations() {
	Map> referenced = new HashMap>();
	List terms = new ArrayList();
	for (TreeNode node : this.children) {
	    terms.addAll(node.getReferencedAnnotations().get(AnnotationType.TERM));
	}
	referenced.put(AnnotationType.TERM, terms);
	return referenced;
    }
    
    public Integer getSent() {
	return this.children.get(0).getSent();
    }
    
    public Integer getPara() {
	return this.children.get(0).getPara();
    }
    
    /*
    @Override
    public boolean equals(Object o) {
	if (this == o) return true;
	if (!(o instanceof NonTerminal)) return false;
	NonTerminal ann = (NonTerminal) o;
	return Utils.areEquals(this.label, ann.label) &&
		Utils.areEquals(this.children, ann.children);
    }
    */
}