http://xml.apache.org/xalan-j/: Serializer to write out XML, HTML etc. as a stream of characters from an input DOM or from input SAX events. (The Apache Software Foundation) 
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 * regarding copyright ownership. The ASF licenses this file
 * to you 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
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/*
 * $Id: PrefixResolver.java 468655 2006-10-28 07:12:06Z minchau $
 */
package org.apache.xml.utils;


The class that implements this interface can resolve prefixes to
namespaces. Examples would include resolving the meaning of a
prefix at a particular point in a document, or mapping the prefixes
used in an XPath expression.

@xsl.usageadvanced
/**
 * The class that implements this interface can resolve prefixes to
 * namespaces. Examples would include resolving the meaning of a
 * prefix at a particular point in a document, or mapping the prefixes
 * used in an XPath expression.
 * @xsl.usage advanced
 */
public interface PrefixResolver
{

  
Given a namespace, get the corrisponding prefix.  This assumes that
the PrefixResolver holds its own namespace context, or is a namespace
context itself.

Params:
  • prefix – The prefix to look up, which may be an empty string ("") for the default Namespace.
Returns:The associated Namespace URI, or null if the prefix
        is undeclared in this context.
/**
   * Given a namespace, get the corrisponding prefix.  This assumes that
   * the PrefixResolver holds its own namespace context, or is a namespace
   * context itself.
   *
   * @param prefix The prefix to look up, which may be an empty string ("") for the default Namespace.
   *
   * @return The associated Namespace URI, or null if the prefix
   *         is undeclared in this context.
   */
  String getNamespaceForPrefix(String prefix);

  
Given a namespace, get the corresponding prefix, based on the context node.

Params:
  • prefix – The prefix to look up, which may be an empty string ("") for the default Namespace.
  • context – The node context from which to look up the URI.
Returns:The associated Namespace URI as a string, or null if the prefix
        is undeclared in this context.
/**
   * Given a namespace, get the corresponding prefix, based on the context node.
   *
   * @param prefix The prefix to look up, which may be an empty string ("") for the default Namespace.
   * @param context The node context from which to look up the URI.
   *
   * @return The associated Namespace URI as a string, or null if the prefix
   *         is undeclared in this context.
   */
  String getNamespaceForPrefix(String prefix, org.w3c.dom.Node context);

  
Return the base identifier.

Returns:The base identifier from where relative URIs should be absolutized, or null 
if the base ID is unknown.


CAVEAT: Note that the base URI in an XML document may vary with where
you are in the document, if part of the doc's contents were brought in
via an external entity reference or if mechanisms such as xml:base have
been used. Unless this PrefixResolver is bound to a specific portion of
the document, or has been kept up to date via some other mechanism, it
may not accurately reflect that context information.
/**
   * Return the base identifier.
   *
   * @return The base identifier from where relative URIs should be absolutized, or null 
   * if the base ID is unknown.
   * <p>
   * CAVEAT: Note that the base URI in an XML document may vary with where
   * you are in the document, if part of the doc's contents were brought in
   * via an external entity reference or if mechanisms such as xml:base have
   * been used. Unless this PrefixResolver is bound to a specific portion of
   * the document, or has been kept up to date via some other mechanism, it
   * may not accurately reflect that context information.
   */
  public String getBaseIdentifier();
  
  public boolean handlesNullPrefixes();
}