diff -r 18a7b139e3fd -r 1824c3cf6ba6 data/dictionary.xml
--- a/data/dictionary.xml	Sat Aug 17 19:54:42 2013 +0200
+++ b/data/dictionary.xml	Sun Aug 18 14:27:14 2013 +0200
@@ -1381,9 +1381,35 @@
 		<tag>xml</tag>
 	</concept>
 	<concept>
+		<term abbreviation="" completeForm="Schematron" language="en"/>
+		<explanation language="en">
+			<text>
+				a validation language;
+				can describe formats based on XML like XSD or DTD does, but has entirely different approach;
+				Schematron is rule-based – defines assertions which must be met to have valid document;
+				this rules are transformed into XSL template which is executed during validation;
+				Schematron can be also combined with XSD
+					– XSD schemas (which are more declarative and more clearly represents the desired structure of the document for humans)
+					are enriched with Schematron assertions that adds more complex rules (that cannot be easily expressed in pure XSD)
+			</text>
+		</explanation>
+		<tag>computer</tag>
+		<tag>xml</tag>
+	</concept>
+	<concept>
 		<term abbreviation="XSLT" completeForm="Extensible Stylesheet Language Transformations" language="en"/>
 		<term abbreviation="XSL" completeForm="Extensible Stylesheet Language" language="en"/>
-		<explanation language="en"><text></text></explanation>
+		<explanation language="en">
+			<text>
+				a transformation language for XML;
+				can be used e.g. for
+					conversion from one XML format to another one,
+					for generating (plain) text or HTML,
+					for user friendly visualisation of XML data (XHTML or SVG output),
+					or for validations (raise error message on invalid input, see also Schematron);
+				XSL templates are also written in XML
+			</text>
+		</explanation>
 		<tag>computer</tag>
 		<tag>xml</tag>
 	</concept>