diff -r 1f56fd19fac6 -r 89cbc713692d data/dictionary.xsd
--- a/data/dictionary.xsd	Sun Jul 07 00:14:32 2013 +0200
+++ b/data/dictionary.xsd	Sun Jul 07 00:28:40 2013 +0200
@@ -25,11 +25,24 @@
 	<xs:element name="dictionary" type="dictionaryType"/>
 
 	<xs:complexType name="dictionaryType">
-		<xs:sequence minOccurs="0" maxOccurs="unbounded">
-			<xs:element name="concept" type="conceptType"/>
+		<xs:sequence>
+			<xs:element name="tags" type="tagsDefinitionType"  minOccurs="0" maxOccurs="1"/>
+			<xs:element name="concept" type="conceptType"  minOccurs="0" maxOccurs="unbounded"/>
 		</xs:sequence>
 	</xs:complexType>
 	
+	<xs:complexType name="tagsDefinitionType">
+		<xs:sequence>
+			<xs:element name="tag" type="tagDefinitionType" minOccurs="0" maxOccurs="unbounded"/>
+		</xs:sequence>
+	</xs:complexType>
+	
+	<xs:complexType name="tagDefinitionType">
+		<xs:attribute name="id" type="xs:string"/>
+		<xs:attribute name="name" type="xs:string"/>
+		<xs:attribute name="description" type="xs:string"/>
+	</xs:complexType>
+	
 	<xs:complexType name="conceptType">
 		<xs:sequence>
 			<xs:element name="term" type="termType" minOccurs="1" maxOccurs="unbounded"/>