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ONT-API is an OWL-API impl over Apache Jena
There is a newer version: 1.4.2
/*
 * This file is part of the ONT API.
 * The contents of this file are subject to the LGPL License, Version 3.0.
 * Copyright (c) 2019, Avicomp Services, AO
 *
 * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
 * This program 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 for more details.
 * You should have received a copy of the GNU General Public License along with this program.  If not, see http://www.gnu.org/licenses/.
 *
 * Alternatively, the contents of this file may be used under the terms of the Apache License, Version 2.0 in which case, the provisions of the Apache License Version 2.0 are applicable instead of those above.
 * Licensed 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 ru.avicomp.ontapi.jena.model;

import org.apache.jena.rdf.model.RDFNode;

/**
 * A technical generic interface to provide {@link RDFNode} value,
 * which can be either {@link OntCE}, {@link OntDR}, {@link OntIndividual} or {@link org.apache.jena.rdf.model.Literal}.
 * This interface is used to construct {@link OntCE class expression}s and {@link OntDR data range}s as a base.
 * 
 * Created by @ssz on 08.05.2019.
 *
 * @param  a subtype of {@link RDFNode}: {@link OntCE}, {@link OntDR}, {@link OntIndividual}
 *            or {@link org.apache.jena.rdf.model.Literal}
 * @see SetValue
 * @since 1.4.0
 */
interface HasValue {

    /**
     * Gets a RDF-value (a filler in OWL-API terms) encapsulated by this expression
     * (that can be either {@link OntCE class} or {@link OntDR data range} expression).
     *
     * The result is not {@code null} even if it is a Unqualified Cardinality Restriction,
     * that has no explicit filler in RDF
     * (the filler is expected to be either {@link ru.avicomp.ontapi.jena.vocabulary.OWL#Thing owl:Thing}
     * for object restriction or {@link org.apache.jena.vocabulary.RDFS#Literal} for data restriction).
     *
     * @return {@link V}, not {@code null}
     * @see SetValue#setValue(RDFNode)
     */
    V getValue();
}