diff --git a/htroot/YMarks.java b/htroot/YMarks.java
index 193cf6f84..d8d9cbd86 100644
--- a/htroot/YMarks.java
+++ b/htroot/YMarks.java
@@ -29,18 +29,19 @@ public class YMarks {
             YMarkRDF rdf = new YMarkRDF("http://"+sb.peers.myAlternativeAddress());
             
             if(post != null && post.containsKey(YMarkEntry.BOOKMARKS_ID)) {
-            	final String id = post.get(YMarkEntry.BOOKMARKS_ID);
-            	final int i = id.indexOf(':');
-            	final String bmk_user = id.substring(0,i);
-            	final String bmk_table = TABLES.BOOKMARKS.tablename(bmk_user);
-            	final byte[] urlHash = UTF8.getBytes(id.substring(i+1, id.length()));
-            	Tables.Row bmk_row;
-				try {
-					bmk_row = sb.tables.select(bmk_table, urlHash);
-		           	rdf.addBookmark(bmk_user, bmk_row);
-				} catch (IOException e) {
-				} catch (SpaceExceededException e) {
-				}            	
+            	final String id[] = post.get(YMarkEntry.BOOKMARKS_ID).split(":");
+            	if(id[1].equals("b")) {
+                	final String bmk_user = id[0];
+                	final String bmk_table = TABLES.BOOKMARKS.tablename(bmk_user);
+                	final byte[] urlHash = UTF8.getBytes(id[2]);
+                	Tables.Row bmk_row;
+    				try {
+    					bmk_row = sb.tables.select(bmk_table, urlHash);
+    		           	rdf.addBookmark(bmk_user, bmk_row);
+    				} catch (IOException e) {
+    				} catch (SpaceExceededException e) {
+    				}    
+            	}
             } else {
             	final Iterator<String> iter = sb.tables.iterator();
             	while(iter.hasNext()) {
@@ -57,7 +58,7 @@ public class YMarks {
                 	}
             	}	
             }
-			prop.put("rdf", rdf.getRDF("RDF/XML"));
+			prop.put("rdf", rdf.getRDF("RDF/XML-ABBREV"));
             return prop;
         }        
         if(isAdmin || isAuthUser) {
diff --git a/source/de/anomic/data/ymark/YMarkRDF.java b/source/de/anomic/data/ymark/YMarkRDF.java
index f3bdadb65..79095a06b 100644
--- a/source/de/anomic/data/ymark/YMarkRDF.java
+++ b/source/de/anomic/data/ymark/YMarkRDF.java
@@ -13,6 +13,7 @@ import net.yacy.cora.lod.vocabulary.DCElements;
 import net.yacy.cora.lod.vocabulary.Rdf;
 import net.yacy.kelondro.blob.Tables;
 
+import com.hp.hpl.jena.rdf.model.Bag;
 import com.hp.hpl.jena.rdf.model.Model;
 import com.hp.hpl.jena.rdf.model.ModelFactory;
 import com.hp.hpl.jena.rdf.model.Property;
@@ -24,9 +25,11 @@ public class YMarkRDF {
 	
 	public final static String USER = "USER";
 	public final static String TYPE = "TYPE";
+	public final static String SUBTOPIC = "SUBTOPIC";
+
 	private final Map<String, Property> property;
 	
-	public final static String BOOKMARK = "/Ymarks.rdf?id=";
+	public final static String BOOKMARK = "/YMarks.rdf?id=";
 	private final StringBuilder resourceURI;
 	private final int len;
 	
@@ -54,6 +57,7 @@ public class YMarkRDF {
 		
 		this.property.put(USER, this.model.createProperty(DCElements.creator.getNamespace(), DCElements.creator.name()));
 		this.property.put(TYPE, this.model.createProperty(Rdf.type.getNamespace(), Rdf.type.name()));
+		this.property.put(SUBTOPIC, this.model.createProperty(AnnoteaB.subTopicOf.getNamespace(), AnnoteaB.subTopicOf.name()));
 	}
 	
 	/**
@@ -70,40 +74,83 @@ public class YMarkRDF {
 		}
 	}
 	
+	public void addTopic(final String bmk_user, final String folder) {
+		this.resourceURI.append(bmk_user);
+		this.resourceURI.append(":f:");
+		this.resourceURI.append(UTF8.String(YMarkUtil.getKeyId(folder)));
+		final Resource topic = this.model.createResource(this.resourceURI.toString());
+		this.resourceURI.setLength(this.len);
+		
+		topic.addProperty(this.property.get(YMarkEntry.BOOKMARK.DATE_MODIFIED.key()), YMarkUtil.EMPTY_STRING);
+		topic.addProperty(this.property.get(YMarkEntry.BOOKMARK.DATE_ADDED.key()), YMarkUtil.EMPTY_STRING);
+		topic.addProperty(this.property.get(USER), bmk_user);
+		topic.addProperty(this.property.get(YMarkEntry.BOOKMARK.DESC.key()), YMarkUtil.EMPTY_STRING);
+		final int i = folder.lastIndexOf(YMarkUtil.FOLDERS_SEPARATOR);
+		if(i>0)
+			topic.addProperty(this.property.get(SUBTOPIC), folder.substring(0, i));
+		topic.addProperty(this.property.get(YMarkEntry.BOOKMARK.TITLE.key()), folder);
+		topic.addProperty(this.property.get(TYPE), AnnoteaB.Topic.getPredicate());
+	}
+	
 	public void addBookmark (final String bmk_user, final Tables.Row bmk_row) {
 		if(bmk_row == null || bmk_row.get(YMarkEntry.BOOKMARK.PUBLIC.key(), YMarkEntry.BOOKMARK.PUBLIC.deflt()).equals("false"))
-			return;		
-		final Resource bmk;			
+			return;				
 		// create an annotea bookmark resource
 		this.resourceURI.append(bmk_user);
-		this.resourceURI.append(':');
+		this.resourceURI.append(":b:");
 		this.resourceURI.append(UTF8.String(bmk_row.getPK()));
-		bmk = this.model.createResource(this.resourceURI.toString());
+		final Resource bmk = this.model.createResource(this.resourceURI.toString());
 		this.resourceURI.setLength(this.len);
 
 		// add properties			
-		bmk.addProperty(this.property.get(TYPE), AnnoteaB.Bookmark.getPredicate());
 		bmk.addProperty(this.property.get(USER), bmk_user);
-		for (final YMarkEntry.BOOKMARK b : YMarkEntry.BOOKMARK.values()) {
-        	switch(b) {
-				case FOLDERS:    					
-					final String[] folders = bmk_row.get(b.key(), b.deflt()).split(YMarkUtil.TAGS_SEPARATOR);
-					for(String folder : folders) {
-						bmk.addProperty(this.property.get(b.key()), folder);
-						// TODO add Topics to RDF
+		for (final YMarkEntry.BOOKMARK b : YMarkEntry.BOOKMARK.values()) {        	
+			switch(b) {
+        		case FOLDERS:    					
+					final String[] folders = bmk_row.get(b.key(), b.deflt()).split(b.seperator());
+					if(folders.length > 1) {
+						Bag topics = this.model.createBag();		
+						for(String folder : folders) {
+							topics.add(folder);
+							this.addTopic(bmk_user, folder);
+						}
+						bmk.addProperty(this.property.get(b.key()), topics);					
+					} else {
+						bmk.addProperty(this.property.get(b.key()), folders[0]);
+						this.addTopic(bmk_user, folders[0]);
+					}
+					break;
+				case TAGS:
+					final String[] tags = bmk_row.get(b.key(), b.deflt()).split(b.seperator());
+					if(tags.length > 1) {
+						Bag subjects = this.model.createBag();					
+						for(String tag : tags) {
+							subjects.add(tag);
+						}					
+						bmk.addProperty(this.property.get(b.key()), subjects);
+					} else {
+						bmk.addProperty(this.property.get(b.key()), tags[0]);	
 					}
 					break;
+					
 				case DATE_ADDED:
 				case DATE_MODIFIED:
 					final YMarkDate date = new YMarkDate(bmk_row.get(b.key()));
 					bmk.addProperty(this.property.get(b.key()), date.toISO8601());
 					break;
+				// these cases are inserted for better readable RDF output
+				case DESC:
+				case URL:
+	        	case TITLE:
+	        		bmk.addProperty(this.property.get(b.key()), bmk_row.get(b.key(), b.deflt()));
+	        		break;
 				default:
 					if(this.property.containsKey(b.key())) {
 						bmk.addProperty(this.property.get(b.key()), bmk_row.get(b.key(), b.deflt()));
 					}
         	}
         }
+		bmk.addProperty(this.property.get(TYPE), AnnoteaB.Bookmark.getPredicate());		
 	}
 
 	public void addBookmarks(final String bmk_user, final Iterator<Tables.Row> riter) {