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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, 2022 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.impl;

import com.sun.xml.xsom.XSAttGroupDecl;
import com.sun.xml.xsom.XSAttributeDecl;
import com.sun.xml.xsom.XSComplexType;
import com.sun.xml.xsom.XSContentType;
import com.sun.xml.xsom.XSElementDecl;
import com.sun.xml.xsom.XSIdentityConstraint;
import com.sun.xml.xsom.XSSimpleType;
import com.sun.xml.xsom.XSTerm;
import com.sun.xml.xsom.XSType;

/**
 * Reference to other schema components.
 * 
 * 
 * There are mainly two different types of references. One is
 * the direct reference, which is only possible when schema components
 * are already available when references are made.
 * The other is the lazy reference, which keeps references by names
 * and later look for the component by name.
 * 
 * 
 * This class defines interfaces that define the behavior of such
 * references and classes that implement direct reference semantics.
 * 
 * @author Kohsuke Kawaguchi ([email protected])
 */
public abstract class Ref {

    /**
     * Default constructor.
     */
    protected Ref() {}

    public interface Term {
        /** Obtains a reference as a term. */
        XSTerm getTerm();
    }

    public interface Type {
        /** Obtains a reference as a type. */
        XSType getType();
    }

    public interface ContentType {
        XSContentType getContentType();
    }
    
    public interface SimpleType extends Ref.Type {
        XSSimpleType getType();
    }
    
    public interface ComplexType extends Ref.Type {
        XSComplexType getType();
    }
    
    public interface Attribute {
        XSAttributeDecl getAttribute();
    }

    public interface AttGroup {
        XSAttGroupDecl get();
    }
    
    public interface Element extends Term {
        XSElementDecl get();
    }

    public interface IdentityConstraint {
        XSIdentityConstraint get();
    }
//
//    
//    private static void _assert( boolean b ) {
//        if(!b)
//            throw new InternalError("assertion failed");
//    }
}