/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.clerezza.rdf.core;

/**
 * A string combined with an optional language tag
 * The lexical form is the string represented by the Literal 
 * without including the language tag
 * 
 * @author reto
 *
 */
public interface PlainLiteral extends Literal {
    public Language getLanguage();
    
    /** 
     * Returns true if <code>obj</code> is an instance of 
     * <code>PlainLiteral</code> for which the lexical form and the language 
     * are equals to the ones of this instance, false otherwise
     * 
     * @return true if obj == this
     */
    public boolean equals(Object obj);
    
    /**
     * Returns the hash code of the lexical form plus the hash code of the language
     * 
     * @return hash code
     */
    public int hashCode();
}
