diff --git a/Doc/Sd1/arrays.xml b/Doc/Sd1/arrays.xml
index 3dd718053e8b76451e96b24f1b4231221b32a8e2..8c205e7aad423900c3db8c9ac87a934ed3b3aafd 100644
--- a/Doc/Sd1/arrays.xml
+++ b/Doc/Sd1/arrays.xml
@@ -11,6 +11,14 @@
          xmlns:db="http://docbook.org/ns/docbook">
   <title>Arrays</title>
 
+  <info>
+    <abstract>
+      <para>Multiple values of common type.</para>
+
+      <para>Loop style handling.</para>
+    </abstract>
+  </info>
+
   <figure xml:id="sd1_array_fig_arrayMotivate">
     <title>Motivating Arrays</title>
 
@@ -894,6 +902,16 @@ final String shapes[] = {"Triangle", "Circle"};</programlisting>
     xlink:href="https://docs.oracle.com/javase/10/docs/api/java/util/Arrays.html">java.util.Arrays</classname>
     helpers</title>
 
+    <info>
+      <abstract>
+        <para>Sorting and searching arrays.</para>
+
+        <para>Fill in values.</para>
+
+        <para>Compare array contents.</para>
+      </abstract>
+    </info>
+
     <figure xml:id="sd1_array_fig_arraysToStringSort">
       <title><classname
       xlink:href="https://docs.oracle.com/javase/10/docs/api/java/util/Arrays.html">Arrays</classname>.<methodname
@@ -1056,18 +1074,27 @@ sort|find(Mandyer): -4</screen>
       xlink:href="https://docs.oracle.com/javase/10/docs/api/java/util/Arrays.html">Arrays</classname>.<methodname
       xlink:href="https://docs.oracle.com/javase/10/docs/api/java/util/Arrays.html#fill(java.lang.Object%5B%5D,int,int,java.lang.Object)">fill(...)</methodname></title>
 
-      <programlisting language="none">final String[] names = {"Eve", "Aaron", "Paul", "Mandy"};
+      <informaltable border="0">
+        <colgroup width="48%"/>
 
-System.out.println("toString: " + Arrays.toString(names));
+        <colgroup width="52%"/>
 
-Arrays.<emphasis role="red">fill(names, "N.N")</emphasis>;
+        <tr>
+          <td valign="top"><programlisting language="none">final String[] names = 
+  {"Eve", "Aaron", "Paul", "Mandy"};
 
-System.out.println("toString: " + Arrays.toString(names));</programlisting>
+System.out.println("toString: " +
+   Arrays.toString(names));
 
-      <para>Result:</para>
+Arrays.<emphasis role="red">fill(names, "N.N")</emphasis>;
+
+System.out.println("toString: " + 
+    Arrays.toString(names));</programlisting></td>
 
-      <screen>toString: [Eve, Aaron, Paul, Mandy]
-toString: [N.N, N.N, N.N, N.N]</screen>
+          <td valign="top"><screen>toString: [Eve, Aaron, Paul, Mandy]
+toString: [N.N, N.N, N.N, N.N]</screen></td>
+        </tr>
+      </informaltable>
     </figure>
 
     <figure xml:id="sd1_array_fig_arraysCopyOf">
@@ -1108,7 +1135,13 @@ l1.equals(l3):false</screen>
   </section>
 
   <section xml:id="sd1_array_sect_extend">
-    <title>Extending an array</title>
+    <title>Extending arrays</title>
+
+    <info>
+      <abstract>
+        <para>Dealing with fixed size.</para>
+      </abstract>
+    </info>
 
     <figure xml:id="sd1_array_fig_arraysExtendArrayProblem">
       <title>Lack of extendability</title>
@@ -1623,6 +1656,15 @@ final int[] sortedValues = Arrays.copyOf(values, values.length);
     <title>Understanding <methodname>static public int main(String[]
     args)</methodname></title>
 
+    <info>
+      <abstract>
+        <para><methodname>main(...)</methodname> and its array
+        argument.</para>
+
+        <para>Implementing parameter passing.</para>
+      </abstract>
+    </info>
+
     <figure xml:id="sd1_array_fig_understandingMain">
       <title><methodname>public static void main(String[]
       args)</methodname></title>
@@ -1926,6 +1968,12 @@ public class AppTest {
   <section xml:id="sd1_array_sect_multidim">
     <title>Multi-dimensional arrays</title>
 
+    <info>
+      <abstract>
+        <para>Multiple dimensions by nesting of arrays.</para>
+      </abstract>
+    </info>
+
     <figure xml:id="sd1_array_fig_multidimArray">
       <title><methodname>Multidimensional arrays</methodname></title>
 
diff --git a/Doc/Sd1/coreClasses.xml b/Doc/Sd1/coreClasses.xml
index 5bd157ebaba782d3465010286ff33a64db4dd407..ab703209ca99f6851e9653d206e6c4bead9a3fad 100644
--- a/Doc/Sd1/coreClasses.xml
+++ b/Doc/Sd1/coreClasses.xml
@@ -11,6 +11,16 @@
          xmlns:db="http://docbook.org/ns/docbook">
   <title>Core Classes</title>
 
+  <info>
+    <abstract>
+      <para>Working with class <classname>String</classname>.</para>
+
+      <para>Operator <code language="java">==</code> pitfalls</para>
+
+      <para>Using <methodname>equals(...)</methodname>.</para>
+    </abstract>
+  </info>
+
   <figure xml:id="sd1_coreclasses_fig_object">
     <title>Superclass <classname
     xlink:href="https://docs.oracle.com/javase/10/docs/api/java/lang/Object.html">Object</classname></title>
@@ -139,6 +149,18 @@ equals: true</screen></td>
   <section xml:id="sw1_sect_CoreClasses_hashing">
     <title>Objects, equals() and hash-values</title>
 
+    <info>
+      <abstract>
+        <para>Why using hash values?</para>
+
+        <para><methodname>hashCode()</methodname> and
+        <methodname>equals(...)</methodname>.</para>
+
+        <para>«Good» <methodname>hashCode()</methodname>
+        implementations.</para>
+      </abstract>
+    </info>
+
     <figure xml:id="sd1_coreclasses_fig_hashPrinciple">
       <title>Hashing principle</title>
 
diff --git a/Doc/Sd1/objectsClasses.xml b/Doc/Sd1/objectsClasses.xml
index 92c87fc024520187ffbfb5cefd8846383c05a8d9..5324db53c8cde07e03b39e6da08641a851aaa7ec 100644
--- a/Doc/Sd1/objectsClasses.xml
+++ b/Doc/Sd1/objectsClasses.xml
@@ -244,9 +244,9 @@ if (null == r) {
       <abstract>
         <para>Significance for larger projects.</para>
 
-        <para>Fully qualified vs. <code>import</code>.</para>
+        <para>Fully qualified vs. «<code>import</code>».</para>
 
-        <para><package>java.lang</package> an other exception rules.</para>
+        <para><package>java.lang</package> and other exceptions.</para>
       </abstract>
     </info>
 
@@ -296,18 +296,16 @@ if (null == r) {
         </listitem>
 
         <listitem>
-          <para>Packages start with reversed <xref linkend="glo_DNS"/> name
-          e.g.:</para>
+          <para>Package names must not contain operators:</para>
 
           <para><uri>mi.hdm<emphasis role="red">-</emphasis>stuttgart.de</uri>
           --&gt; <package>de.hdm<emphasis
           role="red">_</emphasis>stuttgart.mi</package>.</para>
+        </listitem>
 
-          <caution>
-            <para>Notice the <quote><emphasis role="red">-</emphasis></quote>
-            to <quote><emphasis role="red">_</emphasis></quote>
-            translation.</para>
-          </caution>
+        <listitem>
+          <para>Packages should start with reversed <xref linkend="glo_DNS"/>
+          avoiding clashes.</para>
         </listitem>
       </itemizedlist>
     </figure>
@@ -863,12 +861,12 @@ System.out.println("Perimeter=" + r.getPerimeter());</programlisting></td>
 
       <info>
         <abstract>
-          <para>Justifying access restrictions: Conserve implementation
-          flexibility.</para>
+          <para>Justifying access restrictions.</para>
 
-          <para>public, private protected and «package local» rules.</para>
+          <para><code>public</code>, <code>protected</code> «package local»
+          and <code>private</code>.</para>
 
-          <para>Best practices: Be as restrictive as possible.</para>
+          <para>Best practices.</para>
         </abstract>
       </info>
 
@@ -936,12 +934,14 @@ System.out.println("Perimeter=" + r.getPerimeter());</programlisting></td>
         <calloutlist role="slideExclude">
           <callout arearefs="sd1_callout_publicPrivateInterface-1-co"
                    xml:id="sd1_callout_publicPrivateInterface-1">
-            <para>Private attributes only accessible inside class.</para>
+            <para>Private attributes only accessible by methods belonging to
+            class.</para>
           </callout>
 
           <callout arearefs="sd1_callout_publicPrivateInterface-2-co"
                    xml:id="sd1_callout_publicPrivateInterface-2">
-            <para>Public interface accessible by arbitrary classes.</para>
+            <para><code language="java">public</code> items accessible also by
+            alien classes.</para>
           </callout>
         </calloutlist>
       </figure>
diff --git a/ws/Docbook/CustomLayer/slide/slideHdm.xsl b/ws/Docbook/CustomLayer/slide/slideHdm.xsl
index 9f0c4888156d27033a40d19a68c425815398fcb2..536419ddad5a4ba475828040ca8647dcfa8ff862 100644
--- a/ws/Docbook/CustomLayer/slide/slideHdm.xsl
+++ b/ws/Docbook/CustomLayer/slide/slideHdm.xsl
@@ -1,7 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0"
   xmlns:xlink="http://www.w3.org/1999/xlink"
-  xmlns:d="http://docbook.org/ns/docbook">
+  xmlns:d="http://docbook.org/ns/docbook"
+  xmlns="http://www.w3.org/1999/xhtml">
   
   <xsl:import href="../../docbook-xsl/xhtml/chunk.xsl"/>
   <xsl:import href="../../docbook-xsl/xhtml/highlight.xsl"/>
@@ -13,8 +14,6 @@
   
   <xsl:variable name="topicLookup" select="document('topics.tid.xml', .)"/>
   
-  <xsl:param name="slide2lectureref"/>
-  
   <xsl:template match="/">    
     
     <xsl:apply-templates select="(//d:chapter | //d:section | //d:appendix) [contains(@annotations, 'slide') or descendant::*[contains(@annotations, 'slide')]]"
@@ -25,12 +24,11 @@
   <xsl:template name="createBreadcrumbHierarchy">
     <xsl:param name="nodes"/>
     <xsl:param name="currentPosition"/>
-    <ul>
-      <xsl:if test="$currentPosition = 1">
-        <h3>Overview <img src="common/images/compass.svg" width="30ex"
+    <xsl:if test="$currentPosition = 1">
+      <h3>Overview <img src="common/images/compass.svg" width="60"
         style="border: 0mm; margin-top: 0mm; margin-bottom: 0mm;"/></h3>
-      </xsl:if>
-
+    </xsl:if>
+    <ul>
       <li style="list-style-type: none;">
         
         <xsl:if test="not($currentPosition = 1)">
@@ -41,25 +39,63 @@
         <xsl:choose>
           <xsl:when test="$currentPosition &lt; count($nodes)">
             <xsl:variable name="nextPosition" select="$currentPosition + 1"/>
-            <xsl:call-template  name="createBreadcrumbHierarchy" >
+            <xsl:call-template  name="createBreadcrumbHierarchy">
               <xsl:with-param name="nodes" select="$nodes"/>
               <xsl:with-param name="currentPosition" select="$nextPosition"/>
             </xsl:call-template>
           </xsl:when>
           
           <xsl:otherwise>
-            <xsl:for-each select="$nodes[$currentPosition]/d:info/d:abstract/d:para">
+            <div class="slideSectionOverview">
+              <xsl:for-each select="$nodes[$currentPosition]/d:info/d:abstract/d:para">
+                <p>
+                  <xsl:value-of select="."/>
+                </p>
+              </xsl:for-each>
+            </div>
+            <div class ="hdmfooter">
               <p>
-                <xsl:value-of select="."/>
+                <a target="_blank">
+                  <xsl:attribute name="href">
+                    <xsl:for-each select="$nodes[$currentPosition]">
+                      <xsl:call-template name="href.target.uri"/>
+                    </xsl:for-each>
+                  </xsl:attribute>
+                  <xsl:text>Lecture notes</xsl:text>  
+                </a>
               </p>
-            </xsl:for-each>
+            </div>
           </xsl:otherwise>
-        </xsl:choose>
+        </xsl:choose>       
+      </li>
+    </ul>
+  </xsl:template>  
+  
+  <xsl:template name="createTooltipBreadcrumbHierarchy">
+    <xsl:param name="nodes"/>
+    <xsl:param name="currentPosition"/>
+    <ul>
+      <xsl:if test="$currentPosition = 1">
+        <xsl:attribute name="class">tooltiptext</xsl:attribute>
+      </xsl:if>
+      
+      <li style="list-style-type: none;">
+        <xsl:if test="not($currentPosition = 1)">
+          <xsl:text>➟ </xsl:text>
+        </xsl:if>
+        <xsl:value-of select="$nodes[$currentPosition]/d:title"/>
         
+        <xsl:if test="$currentPosition &lt; count($nodes)">
+          <xsl:variable name="nextPosition" select="$currentPosition + 1"/>
+          <xsl:call-template  name="createTooltipBreadcrumbHierarchy">
+            <xsl:with-param name="nodes" select="$nodes"/>
+            <xsl:with-param name="currentPosition" select="$nextPosition"/>
+          </xsl:call-template>
+        </xsl:if>
       </li>
     </ul>
   </xsl:template>  
-
+  
   <xsl:template match="*" mode="slideUnit">
     <xsl:message>
       <xsl:text>No template matching '</xsl:text>
@@ -68,7 +104,7 @@
     </xsl:message>    
   </xsl:template>
   
-  <xsl:template match="d:section" mode="slideDescendants">
+  <xsl:template match="d:chapter|d:section|d:appendix" mode="slideDescendants">
     <section id="{@xml:id}">
       <xsl:call-template name="createBreadcrumbHierarchy">
         <xsl:with-param name="nodes" 
@@ -87,13 +123,14 @@
     </xsl:variable>
     
     <!-- Writing slide series -->    
-    <xsl:document href="{$slideFileName}" method="html" encoding="utf-8" indent="no">
+    <xsl:document href="{$slideFileName}" method="html" encoding="utf-8" indent="yes">
       
       <html lang="en">
         <head>
           <title>
             <xsl:value-of select="d:title"/>
           </title>
+          <link rel="shortcut icon" href="favicon.ico" type="image/x-icon" />
           <link href="common/css/positioning.css" rel="stylesheet" />
           <link href="reveal.js/css/reveal.css" rel="stylesheet" />
           <link href="reveal.js/css/theme/serif.css" id="theme" rel="stylesheet" />
@@ -101,6 +138,53 @@
           <!-- Code syntax highlighting -->
           <link href="reveal.js/lib/css/zenburn.css" rel="stylesheet" />
           
+          <style>
+            /* Tooltip container */
+            .tooltip {
+            position: relative;
+            display: inline-block;
+            border-bottom: 1px dotted black; /* If you want dots under the hoverable text */
+            }
+            
+            /* Tooltip text */
+            .tooltip .tooltiptext {
+            visibility: hidden;
+            width: 600px;
+            background-color: #555;
+            color: #fff;
+            padding: 50px;
+            border-radius: 6px;
+            
+            /* Position the tooltip text */
+            position: absolute;
+            z-index: 1;
+            bottom: 110%;
+            left: 0%;
+            margin-left: -300px;
+            
+            /* Fade in tooltip */
+            opacity: 0;
+            transition: opacity 0.3s;
+            }
+            
+            /* Tooltip arrow */
+            .tooltip .tooltiptext::after {
+            content: "";
+            position: absolute;
+            top: 100%;
+            left: 50%;
+            margin-left: -5px;
+            border-width: 5px;
+            border-style: solid;
+            border-color: #555 transparent transparent transparent;
+            }
+            
+            /* Show the tooltip text when you mouse over the tooltip container */
+            .tooltip:hover .tooltiptext {
+            visibility: visible;
+            opacity: 1;
+            }
+          </style>
         </head>
         
         <body>
@@ -108,7 +192,10 @@
           <div class="reveal">
             <!-- Wrap all slides in a single "slides" class -->
             <div class="slides">
-              <xsl:apply-templates select=".//d:figure[not (ancestor::d:qandaset)] | .//d:section[d:figure[not (ancestor::d:qandaset)]]"
+              <xsl:apply-templates select=".//d:figure[not (ancestor::d:qandaset)] |
+                descendant-or-self::d:chapter[d:figure[not (ancestor::d:qandaset)]]|
+                descendant-or-self::d:section[d:figure[not (ancestor::d:qandaset)]] |
+                descendant-or-self::d:appendix[d:figure[not (ancestor::d:qandaset)]]"
                 mode="slideDescendants"/>
             </div>
           </div>
@@ -166,10 +253,6 @@
       </xsl:choose>
     </xsl:variable>
     
-    <xsl:variable name="webhelpLink">
-      <xsl:call-template name="href.target.uri"/>
-    </xsl:variable>
-
     <xsl:variable name="titleNode" select="d:title"/>
     
     <xsl:variable name="baseSupplementDir">
@@ -199,6 +282,7 @@
       </xsl:if>
     </xsl:variable>
     
+    <xsl:variable name="currentFigure" select="."/>
     <xsl:choose>
       <xsl:when test="1 &lt; count($xfigBasenameSet/*)"> <!-- More than one image: Animation -->
         <section>
@@ -230,18 +314,7 @@
                   </xsl:attribute>              
                 </img>
               </div>
-              <xsl:if test="not($slide2lectureref = 'no')">                
-                <div class ="hdmfooter">
-                  <p>
-                    <a target="_blank" href="{$webhelpLink}">Lecture notes</a>
-                    <xsl:text> </xsl:text>
-                    <a target="_blank" href="#{parent::*/@xml:id}">
-                      <img src="common/images/compass.svg" width="30ex"
-                        style="border: 0mm; margin-top: 0mm; margin-bottom: 0mm;"/>
-                    </a>                    
-                  </p>
-                </div>              
-              </xsl:if>
+              <xsl:apply-templates select="$currentFigure" mode="footer"/>
             </section>
           </xsl:for-each>
         </section>
@@ -249,34 +322,8 @@
       
       <xsl:otherwise> <!-- no animated image -->
         <section id="{$primarySectionId}">
-          
           <xsl:apply-templates select="."/>
-          
-          <xsl:if test="not($slide2lectureref = 'no')">
-            <div class ="hdmfooter">
-              <p>
-                <a target="_blank" href="{$webhelpLink}">Lecture notes</a>
-                <xsl:text> </xsl:text>
-                <a target="_blank" href="#{parent::*/@xml:id}">
-                  <img src="common/images/compass.svg" width="30ex"
-                    style="border: 0mm; margin-top: 0mm; margin-bottom: 0mm;"/>
-                </a>                    
-                <xsl:variable name="qandaId" select="@xml:id"/>
-                <xsl:if test="$topicLookup/map/entry[@id = $qandaId]">
-                  <xsl:text> | </xsl:text>        
-                  <xsl:variable name="tid" select="$topicLookup/map/entry[@id = $qandaId]/@tid"/>
-                  <a target="_blank">
-                    <xsl:attribute name="href">
-                      <xsl:text>https://bb.mi.hdm-stuttgart.de/topic/</xsl:text>
-                      <xsl:value-of select="$tid"/>
-                    </xsl:attribute>
-                    <img src="common/images/comment.svg" width="30ex" style="border: 0mm;"/>
-                    <xsl:text> create comment</xsl:text>
-                  </a>
-                </xsl:if>        
-              </p>
-            </div>
-          </xsl:if>
+          <xsl:apply-templates select="." mode="footer"/>          
         </section>
       </xsl:otherwise>      
     </xsl:choose>
@@ -313,11 +360,59 @@
             </ul>
           </xsl:otherwise>
         </xsl:choose>  
-      </section>
-      
+      </section>      
     </xsl:if>
   </xsl:template>
   
+  <xsl:template match="*" mode="footer">
+    <xsl:message>
+      <xsl:text>No template defined for element "</xsl:text>
+      <xsl:value-of select="name(.)"/>
+      <xsl:text>" in mode "footer"</xsl:text>
+    </xsl:message>
+  </xsl:template>
+
+  <xsl:template match="d:figure" mode="footer"> 
+  
+    <div class="hdmfooter">              
+      <table>
+        <tr>
+          <td class="tooltip">
+            <a target="_blank">
+              <xsl:attribute name="href">
+                <xsl:call-template name="href.target.uri"/>
+              </xsl:attribute>
+              <img src="common/images/book.svg" width="60"
+                style="border: 0mm; margin-top: 0mm; margin-bottom: 0mm;"></img>
+              <p class="tooltiptext">Lecture notes</p>
+            </a>
+          </td>
+          <td class="tooltip">
+            <a  target="_blank" href="#{parent::*/@xml:id}">
+              <img src="common/images/compass.svg" width="60"
+                style="border: 0mm; margin-top: 0mm; margin-bottom: 0mm;"></img>
+            </a>
+            <xsl:call-template name="createTooltipBreadcrumbHierarchy">
+              <xsl:with-param name="nodes" 
+                select="ancestor-or-self::d:section|ancestor-or-self::d:chapter|ancestor-or-self::d:appendix"/>
+              <xsl:with-param name="currentPosition" select="1"/>
+            </xsl:call-template>
+          </td>
+          <xsl:variable name="qandaId" select="@xml:id"/>
+          <xsl:if test="$topicLookup/map/entry[@id = $qandaId]">
+            
+            <td class="tooltip">
+              <a target="_blank" href="https://bb.mi.hdm-stuttgart.de/topic/{$topicLookup/map/entry[@id = $qandaId]/@tid}">
+                <img src="common/images/comment.svg"
+                  style="border: 0mm; margin-top: 0mm; margin-bottom: 0mm;" width="60" ></img></a>
+              <p class="tooltiptext">Create comment</p>
+            </td>
+          </xsl:if>                    
+        </tr>
+      </table>
+    </div>
+  </xsl:template>
+  
   <xsl:template match="d:qandaset" mode="qandaNumber">
     <xsl:variable name="parentId" select="ancestor::d:part/@xml:id"/>    
     <xsl:value-of select="count(preceding::d:qandaset[ancestor::d:part/@xml:id = $parentId]) + 1"/>
@@ -444,6 +539,5 @@
       <xsl:text>Your Browser does not support the video tag</xsl:text>
     </video>
   </xsl:template>
-  
-  
+ 
 </xsl:stylesheet>
diff --git a/ws/Docbook/CustomLayer/webhelp/positioning.css.patch b/ws/Docbook/CustomLayer/webhelp/positioning.css.patch
index 08fa25fca7a94cd518fda1c908d27a28641a2ef8..b23f4b9ef282bc83cdd3e472f6a14cf5b5bb1d9a 100644
--- a/ws/Docbook/CustomLayer/webhelp/positioning.css.patch
+++ b/ws/Docbook/CustomLayer/webhelp/positioning.css.patch
@@ -1,5 +1,5 @@
---- positioning.css.orig	2018-11-17 13:48:07.180040443 +0100
-+++ positioning.css	2018-11-17 13:49:03.923387718 +0100
+--- /usr/share/hdm-docbook-xsl/docbook-xsl-1.79.2/webhelp/template/common/css/positioning.css	2016-12-09 23:39:10.000000000 +0100
++++ positioning.css	2019-05-11 12:28:00.610579125 +0200
 @@ -1,3 +1,8 @@
 +/*  
 + *   patched by: /usr/share/hdm-docbook-xsl/CustomLayer/webhelp/positioning.css.patch 
@@ -80,7 +80,7 @@
  #content .qandaset>table, #content .qandaset>table td, #content .calloutlist table, #content .calloutlist table td, #content .navfooter table, #content .navfooter table td {
      border: 0px solid;
  }
-@@ -375,3 +394,136 @@
+@@ -375,3 +394,142 @@
  
  }
  
@@ -214,6 +214,12 @@
 +    border-radius: 2ex;
 +}
 +
++.slideSectionOverview {
++    background-color: #FCFFCD;
++    border-radius: 25px;
++    padding-left: 10px;
++}
++
 +a:hover {
 +    color: LightSkyBlue;
 +}
diff --git a/ws/Docbook/Extensions/Tdata/Common/Components/exampleSlides.xml b/ws/Docbook/Extensions/Tdata/Common/Components/exampleSlides.xml
index 7dcfe69fa36e176aaef1e0ae36a1ab629a2b2d74..26f50fceb1907bf5a623d44bc36599742f522056 100644
--- a/ws/Docbook/Extensions/Tdata/Common/Components/exampleSlides.xml
+++ b/ws/Docbook/Extensions/Tdata/Common/Components/exampleSlides.xml
@@ -19,6 +19,14 @@
     <section xml:id="objectsClassesBasics">
       <title>Classes in OO languages</title>
 
+      <info>
+        <abstract>
+          <para>Some info</para>
+
+          <para>More info</para>
+        </abstract>
+      </info>
+
       <figure xml:id="classRationale">
         <title>What are classes?</title>
 
@@ -96,7 +104,7 @@
       </qandaset>
 
       <qandaset defaultlabel="qanda" xml:id="qandaHumanRelated2">
-        <title><xref linkend="glo_Unicode"/> representations</title>
+        <title> Unicode representations</title>
 
         <qandadiv>
           <qandaentry>
@@ -229,6 +237,7 @@ drwxr-xr-x 100 goik fb1prof  12288 Jul 13 07:43 ..
 
     <section xml:id="MathML">
       <title>Mathematical formulas</title>
+
       <info>
         <abstract>
           <para>Examples displaying both inline and block formulas.</para>