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  /*
   * #%L
   * =====================================================
   *   _____                _     ____  _   _       _   _
   *  |_   _|_ __ _   _ ___| |_  / __ \| | | | ___ | | | |
   *    | | | '__| | | / __| __|/ / _` | |_| |/ __|| |_| |
   *    | | | |  | |_| \__ \ |_| | (_| |  _  |\__ \|  _  |
   *    |_| |_|   \__,_|___/\__|\ \__,_|_| |_||___/|_| |_|
   *                             \____/
  * 
  * =====================================================
  * 
  * Hochschule Hannover
  * (University of Applied Sciences and Arts, Hannover)
  * Faculty IV, Dept. of Computer Science
  * Ricklinger Stadtweg 118, 30459 Hannover, Germany
  * 
  * Email: trust@f4-i.fh-hannover.de
  * Website: http://trust.f4.hs-hannover.de/
  * 
  * This file is part of ifmapj, version 2.0.1, implemented by the Trust@HsH
  * research group at the Hochschule Hannover.
  * %%
  * Copyright (C) 2010 - 2014 Trust@HsH
  * %%
  * Licensed 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
  * limitations under the License.
  * #L%
  */
 package de.hshannover.f4.trust.ifmapj.metadata;

Interface for common IF-MAP metadata attributes.
 
 public interface Metadata {

Return the publisher id of this metadata. If this metadata object has no publisher id the empty string is returned. If the extraction of the publisher id fails null is returned.

Returns:
the publisher id, null or the empty string
 
 	public String getPublisherId();

Return the publish timestamp of this metadata. If this metadata object has no publish timestamp the empty string is returned. If the extraction of the publish timestamp fails null is returned.

Returns:
the publish timestamp, null or the empty string
 
Return the type name of this metadata, including the namespace prefix. If the extraction of the type name fails null is returned.

Returns:
the type name or null
 
 	public String getTypename();

Return the local type name of this metadata without the namespace prefix. If the extraction of the type name fails null is returned.

Returns:
the local type name or null
 
 	public String getLocalname();

Return the cardinality of this metadata. If this metadata object has no cardinality the empty string is returned. If the extraction of the cardinality fails null is returned.

Returns:
the cardinality, null or the empty string
 
 	public String getCardinality();

Return true if this metadata has 'singleValue' cardinality.

Returns:
true if cardinality equals 'singleValue'
 
 	public boolean isSingleValue();

Return true if this metadata has 'multiValue' cardinality.

Returns:
true if cardinality equals 'multiValue'
	public boolean isMultiValue();

Returns a formatted XML string representation of this metadata document.

Returns:
formatted XML string
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