diff --git a/src/main/java/w2phtml/rdf/DocumentStructure.java b/src/main/java/w2phtml/rdf/DocumentStructure.java
index 48f959e..9ba434f 100644
--- a/src/main/java/w2phtml/rdf/DocumentStructure.java
+++ b/src/main/java/w2phtml/rdf/DocumentStructure.java
@@ -41,6 +41,7 @@ public class DocumentStructure {
 		this.elements = new HashMap<String, Resource>();
 		this.inputParts = new HashMap<String, DocumentPart>(); 
 		this.m = ModelFactory.createOntologyModel();
+		m.read(DocumentStructure.class.getResource("/w2phtml/rdf/resources/text_structures.rdf").toString());
 		this.excerptClass = m.createClass(TS + EXCERPT);
 		this.elementClass = m.createClass(TS + TOC_ELEMENT);
 		this.itemClass = m.createClass(TS + TOCITEM);
@@ -166,11 +167,27 @@ public class DocumentStructure {
 		if (isNotBlacklisted(name)) {
 			name = convertName(name);
 			if (isDefinedInOntology(resource,name)) {
-				Property property = m.createProperty(TS + name);
-				resource.addProperty( property, value);	
+				if (name.equals("keywords")) {
+					addKeywords(resource, name, value);
+				} else {
+					Property property = m.createProperty(TS + name);
+					resource.addProperty( property, value);
+				}
+					
 			}
 		}
 	}
+	private void addKeywords(Resource resource,String name, String value) {
+		String[] keywords = value.split(",");
+		for (int i = 0; i < keywords.length; i++) {
+			String keyword = keywords[i].trim();
+			if (!keyword.isEmpty()) {
+				Property property = m.createProperty(TS + name);
+				resource.addProperty( property, keyword);
+			}
+		}
+	}
+	
 	private boolean isDefinedInOntology(Resource resource, String name) {
 		String nameSpace = resource.getNameSpace();
 		if (nameSpace.contains(TS + EXCERPT)) {