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XML Schema Object Model (XSOM) is a Java library that allows applications to easily parse XML Schema documents and inspect information in them. It is expected to be useful for applications that need to take XML Schema as an input.
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/*
 * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0, which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package com.sun.xml.xsom;

/*-
 * #%L
 * XSOM
 * %%
 * Copyright (C) 2019 - 2020 Entur
 * %%
 * Licensed under the EUPL, Version 1.1 or – as soon they will be
 * approved by the European Commission - subsequent versions of the
 * EUPL (the "Licence");
 * 
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * 
 * http://ec.europa.eu/idabc/eupl5
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 * #L%
 */

import java.util.List;
import java.util.Set;

/**
 * Element declaration.
 * 
 * @author
 *  Kohsuke Kawaguchi ([email protected])
 */
public interface XSElementDecl extends XSDeclaration, XSTerm
{
    /**
     * Gets the type of this element declaration.
     * @return
     *      always non-null.
     */
    XSType getType();

    boolean isNillable();

    /**
     * Gets the substitution head of this element, if any.
     * Otherwise null.
     */
    XSElementDecl getSubstAffiliation();

    /**
     * Returns all the {@link XSIdentityConstraint}s in this element decl.
     *
     * @return
     *      never null, but can be empty.
     */
    List getIdentityConstraints();

    /**
     * Checks the substitution excluded property of the schema component.
     * 
     * IOW, this checks the value of the final attribute
     * (plus finalDefault).
     * 
     * @param method
     *      Possible values are {@link XSType#EXTENSION} or
     *      XSType.RESTRICTION.
     */
    boolean isSubstitutionExcluded(int method);

    /**
     * Checks the diallowed substitution property of the schema component.
     * 
     * IOW, this checks the value of the block attribute
     * (plus blockDefault).
     * 
     * @param method
     *      Possible values are {@link XSType#EXTENSION},
     *      XSType.RESTRICTION, or XSType.SUBSTITUTION
     */
    boolean isSubstitutionDisallowed(int method);

    boolean isAbstract();

    /**
     * Returns the element declarations that can substitute
     * this element.
     * 
     * 
     * IOW, this set returns all the element decls that satisfies
     * 
     * the "Substitution Group OK" constraint.
     * 
     * 
     * @return
     *      nun-null valid array. The return value always contains this element
     *      decl itself. 
     * 
     * @deprecated
     *      this method allocates a new array every time, so it could be
     *      inefficient when working with a large schema. Use
     *      {@link #getSubstitutables()} instead.
     */
    XSElementDecl[] listSubstitutables();
    
    /**
     * Returns the element declarations that can substitute
     * this element.
     * 
     * 

     * IOW, this set returns all the element decls that satisfies
     * 
     * the "Substitution Group OK" constraint.
     * 
     * 
     * 

     * Note that the above clause does NOT check for
     * abstract elements. So abstract elements may still show up
     * in the returned set.
     * 
     * @return
     *      nun-null unmodifiable list.
     *      The returned list always contains this element decl itself. 
     */
    Set getSubstitutables();
    
    /**
     * Returns true if this element declaration can be validly substituted
     * by the given declaration.
     * 
     * 
     * Just a short cut of {@code getSubstitutables().contain(e);}
     */
    boolean canBeSubstitutedBy(XSElementDecl e);

    // TODO: identitiy constraints
    // TODO: scope

    XmlString getDefaultValue();
    XmlString getFixedValue();

    /**
     * Used for javadoc schema generation
     *
     * @return
     *    null if form attribute not present,
     *    true if form attribute present and set to qualified,
     *    false if form attribute present and set to unqualified.
     */

    Boolean getForm();
}