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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;

import java.util.Iterator;
import java.util.Collection;

import com.sun.xml.xsom.visitor.XSWildcardFunction;
import com.sun.xml.xsom.visitor.XSWildcardVisitor;

/**
 * Wildcard schema component (used for both attribute wildcard
 * and element wildcard.)
 * 
 * XSWildcard interface can always be downcasted to either
 * Any, Other, or Union.
 */
public interface XSWildcard extends XSComponent, XSTerm
{
    int LAX = 1;
    int STRTICT = 2;
    int SKIP = 3;
    /**
     * Gets the processing mode.
     * 
     * @return
     *      Either LAX, STRICT, or SKIP.
     */
    int getMode();

    /**
     * Returns true if the specified namespace URI is valid
     * wrt this wildcard.
     * 
     * @param namespaceURI
     *      Use the empty string to test the default no-namespace.
     */
    boolean acceptsNamespace(String namespaceURI);

    /** Visitor support. */
    void visit(XSWildcardVisitor visitor);
     T apply(XSWildcardFunction function);

    /**
     * ##any wildcard.
     */
    interface Any extends XSWildcard {
    }
    /**
     * ##other wildcard.
     */
    interface Other extends XSWildcard {
        /**
         * Gets the namespace URI excluded from this wildcard.
         */
        String getOtherNamespace();
    }
    /**
     * Wildcard of a set of namespace URIs.
     */
    interface Union extends XSWildcard {
        /**
         * Short for getNamespaces().iterator()
         */
        Iterator iterateNamespaces();

        /**
         * Read-only list of namespace URIs.
         */
        Collection getNamespaces();
    }
}