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/*
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 * of the Common Development and Distribution License
 * (the "License").  You may not use this file except
 * in compliance with the License.
 * 
 * You can obtain a copy of the license at
 * https://jwsdp.dev.java.net/CDDLv1.0.html
 * See the License for the specific language governing
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 * 
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package com.sun.xml.txw2;

/**
 * Used by {@link DatatypeWriter} to declare additional namespaces.
 *
 * @see DatatypeWriter
 * @author Kohsuke Kawaguchi
 */
public interface NamespaceResolver {
    /**
     * Allocates a prefix for the specified URI and returns it.
     *
     * @param nsUri
     *      the namespace URI to be declared. Can be empty but must not be null.
     * @return
     *      the empty string if the URI is bound to the default namespace.
     *      Otherwise a non-empty string that represents a prefix.
     */
    String getPrefix(String nsUri);
}