diff -r 6daaf1c6fede -r e0319809d533 data/dictionary.xml
--- a/data/dictionary.xml	Mon Aug 19 21:42:46 2013 +0200
+++ b/data/dictionary.xml	Mon Aug 19 21:48:02 2013 +0200
@@ -1646,13 +1646,27 @@
 	</concept>
 	<concept>
 		<term abbreviation="DTD" completeForm="document type definition" language="en"/>
-		<explanation language="en"><text></text></explanation>
+		<explanation language="en">
+			<text>
+				a schema language for XML;
+				used to describe the format based on XML
+				and perform validations of XML documents
+			</text>
+		</explanation>
 		<tag>computer</tag>
 		<tag>xml</tag>
 	</concept>
 	<concept>
 		<term abbreviation="XSD" completeForm="XML schema definition" language="en"/>
-		<explanation language="en"><text></text></explanation>
+		<explanation language="en">
+			<text>
+				a schema language for XML;
+				used to describe the format based on XML
+				and perform validations of XML documents
+				XSD itself is written in XML;
+				is more powerful than DTD
+			</text>
+		</explanation>
 		<tag>computer</tag>
 		<tag>xml</tag>
 	</concept>