fix DC.Elements namespace in DublinCore vocabulary class

delete redundant (unused) DCElements.

source/net/yacy/cora/lod/vocabulary/DCElements.java

@@ -1,76 +0,0 @@
-/**
- *  DublinCore
- *  Copyright 2011 by Michael Peter Christen, mc@yacy.net, Frankfurt am Main, Germany
- *  First released 16.12.2011 at http://yacy.net
- *
- *  $LastChangedDate: 2011-04-14 00:04:23 +0200 (Do, 14 Apr 2011) $
- *  $LastChangedRevision: 7653 $
- *  $LastChangedBy: orbiter $
- *
- *  This library is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU Lesser General Public
- *  License as published by the Free Software Foundation; either
- *  version 2.1 of the License, or (at your option) any later version.
- *
- *  This library is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- *  Lesser General Public License for more details.
- *
- *  You should have received a copy of the GNU Lesser General Public License
- *  along with this program in the file lgpl21.txt
- *  If not, see <http://www.gnu.org/licenses/>.
- */
-
-
-package net.yacy.cora.lod.vocabulary;
-
-import java.util.Set;
-
-import net.yacy.cora.lod.Literal;
-import net.yacy.cora.lod.Vocabulary;
-
-public enum DCElements implements Vocabulary {
-
-
-    creator,
-    date,
-    description,
-    subject,
-    title;
-
-    public final static String IDENTIFIER = "http://purl.org/dc/elements/1.1/";
-    public final static String PREFIX = "dc";
-
-    private final String predicate, uriref;
-
-    private DCElements() {
-        this.predicate = IDENTIFIER +  this.name().toLowerCase();
-        this.uriref = PREFIX + ':' + this.name().toLowerCase();
-    }
-
-    @Override
-    public String getNamespace() {
-        return IDENTIFIER;
-    }
-
-    @Override
-    public String getNamespacePrefix() {
-        return PREFIX;
-    }
-
-    @Override
-    public Set<Literal> getLiterals() {
-        return null;
-    }
-
-    @Override
-    public String getPredicate() {
-        return this.predicate;
-    }
-
-    @Override
-    public String getURIref() {
-        return this.uriref;
-    }
-}

source/net/yacy/cora/lod/vocabulary/DublinCore.java

@@ -30,6 +30,12 @@ import java.util.Set;
 import net.yacy.cora.lod.Literal;
 import net.yacy.cora.lod.Vocabulary;
 
+/**
+ * Dublin Core Metadata Element Set, Version 1.1
+ * http://www.dublincore.org/documents/dces/ The Dublin Core Metadata Element
+ * Set is a vocabulary of fifteen properties for use in resource description.
+ *
+ */
 public enum DublinCore implements Vocabulary {
 
     Contributor,
@@ -48,19 +54,19 @@ public enum DublinCore implements Vocabulary {
     Title,
     Type;
 
-    public final static String IDENTIFIER = "http://dublincore.org/documents/2010/10/11/dces/";
+    public final static String NAMESPACE = "http://purl.org/dc/elements/1.1/";
     public final static String PREFIX = "dc";
 
     private final String predicate, uriref;
 
     private DublinCore() {
-        this.predicate = IDENTIFIER +  this.name().toLowerCase();
+        this.predicate = NAMESPACE +  this.name().toLowerCase();
         this.uriref = PREFIX + ':' + this.name().toLowerCase();
     }
 
     @Override
     public String getNamespace() {
-        return IDENTIFIER;
+        return NAMESPACE;
     }
 
     @Override