/*
 * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */
package org.relaxng.datatype;

/**
 * An interface that must be implemented by caller to
 * provide context information that is necessary to 
 * perform validation of some Datatypes.
 * 
 * @author <a href="mailto:jjc@jclark.com">James Clark</a>
 * @author <a href="mailto:kohsuke.kawaguchi@sun.com">Kohsuke KAWAGUCHI</a>
 */
public interface ValidationContext {
	
	/**
	 * Resolves a namespace prefix to the corresponding namespace URI.
	 * 
	 * This method is used for validating the QName type, for example.
	 *
	 * <p>
	 * If the prefix is "" (empty string), it indicates
	 * an unprefixed value. The callee
	 * should resolve it as for an unprefixed
	 * element, rather than for an unprefixed attribute.
	 * 
	 * <p>
	 * If the prefix is "xml", then the callee must resolve
	 * this prefix into "http://www.w3.org/XML/1998/namespace",
	 * as defined in the XML Namespaces Recommendation.
	 * 
	 * @return
	 *		namespace URI of this prefix.
	 *		If the specified prefix is not declared,
	 *		the implementation must return null.
	 */
	String resolveNamespacePrefix( String prefix );

	/**
	 * Returns the base URI of the context.  The null string may be returned
	 * if no base URI is known.
	 */
	String getBaseUri();

	/**
	 * Checks if an unparsed entity is declared with the
	 * specified name.
	 * 
	 * @return
	 *  true
	 *		if the DTD has an unparsed entity declaration for
	 *		the specified name.
	 *  false
	 *		otherwise.
	 */
	boolean isUnparsedEntity( String entityName );

	/**
	 * Checks if a notation is declared with the
	 * specified name.
	 * 
	 * @return
	 *  true
	 *		if the DTD has a notation declaration for the specified name.
	 *  false
	 *		otherwise.
	 */
	boolean isNotation( String notationName );
}