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
}