diff --git a/Doc/Sda1/xmlschema.xml b/Doc/Sda1/xmlschema.xml
index 574a6731acc7342be13b05145d9968363427c0bb..12f68699fadb6bac882dae74569e6c13a665360a 100644
--- a/Doc/Sda1/xmlschema.xml
+++ b/Doc/Sda1/xmlschema.xml
@@ -897,7 +897,7 @@ public class Memo {
                   'customer'.</glossterm>
 
                   <glossdef>
-                    <programlisting language="none">&lt;data ... ="../invoice.xsd"&gt;
+                    <programlisting language="xml">&lt;data ... ="../invoice.xsd"&gt;
     &lt;customer &gt;
         &lt;name&gt;Clarke Jefferson&lt;/name&gt;
     &lt;/customer&gt;
@@ -911,7 +911,7 @@ public class Memo {
                   'int'</glossterm>
 
                   <glossdef>
-                    <programlisting language="none">    &lt;customer id="five"&gt;
+                    <programlisting language="xml">    &lt;customer id="five"&gt;
         &lt;name&gt;Clarke Jefferson&lt;/name&gt;
     &lt;/customer&gt;</programlisting>
                   </glossdef>
@@ -922,7 +922,7 @@ public class Memo {
                   'decimal'</glossterm>
 
                   <glossdef>
-                    <programlisting language="none">    &lt;customer id="5"&gt;
+                    <programlisting language="xml">    &lt;customer id="5"&gt;
   ...
     &lt;invoice customer="5" status="due"&gt;33,12&lt;/invoice&gt;</programlisting>
                   </glossdef>
@@ -933,7 +933,7 @@ public class Memo {
                   constraint "customerId" of element "data"</glossterm>
 
                   <glossdef>
-                    <programlisting language="none">    &lt;customer id="5"&gt;
+                    <programlisting language="xml">    &lt;customer id="5"&gt;
         &lt;name&gt;Clarke Jefferson&lt;/name&gt;
     &lt;/customer&gt;
     
@@ -948,7 +948,7 @@ public class Memo {
                   for identity constraint of element 'data'</glossterm>
 
                   <glossdef>
-                    <programlisting language="none">    &lt;customer id="5"&gt;
+                    <programlisting language="xml">    &lt;customer id="5"&gt;
         &lt;name&gt;Clarke Jefferson&lt;/name&gt;
     &lt;/customer&gt;