// $Id: Variant.java,v 1.1 2002/04/25 18:12:42 bill Exp $

package com.jclark.xsl.expr;

import com.jclark.xsl.om.*;

public interface Variant {
    String convertToString() throws XSLException;
    boolean convertToBoolean() throws XSLException;
    Variant makePermanent() throws XSLException;
    NodeIterator convertToNodeSet() throws XSLException;
    double convertToNumber() throws XSLException;
    Object convertToObject() throws XSLException;
    boolean convertToPredicate(ExprContext context) throws XSLException;
    boolean isBoolean();
    boolean isNumber();
    boolean isString();
    boolean isNodeSet();
    Node getBaseNode();		// for base URI; null if none
}