diff --git a/Doc/Sd1/objectsClasses.xml b/Doc/Sd1/objectsClasses.xml
index f863021c72ceb362aaeba1ec8419ddd190254a68..f3b6d837c19782ae5efe80ea9eb96731edf292c5 100644
--- a/Doc/Sd1/objectsClasses.xml
+++ b/Doc/Sd1/objectsClasses.xml
@@ -3271,7 +3271,7 @@ Club's member count:3</screen>
     </figure>
 
     <figure xml:id="sd1_fig_staticNoInstanceNeeded">
-      <title>Why creating an instance?</title>
+      <title>Why requiring an instance?</title>
 
       <informaltable border="1">
         <tr>
@@ -3293,11 +3293,11 @@ Club's member count:3</screen>
         </tr>
       </informaltable>
 
-      <para>Observation: No object state required.</para>
+      <para>Observation: Object state irrelevant.</para>
     </figure>
 
     <figure xml:id="sd1_fig_staticStateIndependentMethods">
-      <title>Solution: Use a class method</title>
+      <title>Favour class over instance method</title>
 
       <informaltable border="1">
         <tr>
@@ -4447,8 +4447,8 @@ Largest long value:9223372036854775807</screen></td>
                 </tr>
               </informaltable>
 
-              <para>So 21! already yields a negative value. Actually
-              <inlineequation>
+              <para>So <code>21!</code> already yields a negative value.
+              Actually <inlineequation>
                   <m:math display="inline">
                     <m:mrow>
                       <m:mrow>
@@ -4618,17 +4618,16 @@ Largest long value:9223372036854775807</screen></td>
                       </m:mrow>
                     </m:mrow>
                   </m:math>
-                </inlineequation> having identical value by adding a simple
-              <code>if</code> statement:</para>
+                </inlineequation> having identical value:</para>
 
               <programlisting language="java">  public static long binomial(int n, int k) {
     
-    // Trying to avoid arithmetic overflow by making use of:
+    // Trying to avoid arithmetic overflow using:
     //             n        n
     //           (   ) =  (   )
     //             k       n-k
     //
-    if (n / 2 &lt; k) {
+    if (n - k &lt; k) {
       k = n - k;
     }
     
diff --git a/ws/Docbook/CustomLayer/slide/slideHdm.xsl b/ws/Docbook/CustomLayer/slide/slideHdm.xsl
index b8b4b0b8fc6949ba43c732e269e8b0d1be45e39e..5cdf15f37e9b9a1d9721cd9474fb4f1fc0bd7c68 100644
--- a/ws/Docbook/CustomLayer/slide/slideHdm.xsl
+++ b/ws/Docbook/CustomLayer/slide/slideHdm.xsl
@@ -133,11 +133,25 @@
         <xsl:with-param name="path" select="d:mediaobject/d:imageobject/d:imagedata/@fileref"/>
         <xsl:with-param name="separator" select="'.fig.svg'"/>
       </xsl:call-template>
+      <xsl:call-template name="hdm.get.leftmost.of.separator">
+        <xsl:with-param name="path" select="d:mediaobject/d:imageobject/d:imagedata/@fileref"/>
+        <xsl:with-param name="separator" select="'.multi.svg'"/>
+      </xsl:call-template>
     </xsl:variable>
     
 
     <xsl:if test="0 &lt; string-length($xfigBasename)">
       <xsl:variable name="xfigBasenameSet" select="document(concat($xfigBasename, '.filenames'), .)/start/file"/>
+      
+      <xsl:message>
+        <xsl:text>---------------</xsl:text>
+        <xsl:value-of select="d:mediaobject/d:imageobject/d:imagedata/@fileref"/>
+        <xsl:text>:</xsl:text>
+        <xsl:value-of select="$xfigBasename"/>
+        <xsl:text>:</xsl:text>
+        <xsl:value-of select="$xfigBasenameSet"/>
+      </xsl:message>
+      
       <xsl:if test="count($xfigBasenameSet)">
         <xsl:for-each select="$xfigBasenameSet">
           <xsl:if test="position() &lt; last()">
@@ -147,15 +161,17 @@
               </xsl:if>
               
               <xsl:apply-templates select="$titleNode"/>
-              <img alt="layered SVG image">
-                <xsl:attribute name="src">
-                  <xsl:value-of select="$baseSupplementDir"/>
-                  <xsl:value-of select="$xfigBasename"/>
-                  <xsl:text>-</xsl:text>
-                  <xsl:value-of select="position() - 1"/>
-                  <xsl:text>.svg</xsl:text>
-                </xsl:attribute>              
-              </img>
+              <div class="mediaobject">
+                <img alt="layered SVG image" width="810">
+                  <xsl:attribute name="src">
+                    <xsl:value-of select="$baseSupplementDir"/>
+                    <xsl:value-of select="$xfigBasename"/>
+                    <xsl:text>-</xsl:text>
+                    <xsl:value-of select="position() - 1"/>
+                    <xsl:text>.svg</xsl:text>
+                  </xsl:attribute>              
+                </img>
+              </div>
               
               <div class ="hdmfooter">
                 <p>
diff --git a/ws/Docbook/Extensions/Tdata/Scale/FormatXfig/Ref/stack.multi.svg b/ws/Docbook/Extensions/Tdata/Scale/FormatXfig/Ref/stack.multi.svg
new file mode 100644
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--- /dev/null
+++ b/ws/Docbook/Extensions/Tdata/Scale/FormatXfig/Ref/stack.multi.svg
@@ -0,0 +1,490 @@
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+   id="tspan5092">true</tspan></tspan></text>
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+  <g
+     ns1:masterSlide="masterSlide"
+     transform="translate(-14.010514,-48.2652)"
+     inkscape:label="Master"
+     inkscape:groupmode="layer"
+     id="layer1"
+     style="display:inline"
+     sodipodi:insensitive="true">
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diff --git a/ws/Docbook/Extensions/Tdata/Scale/FormatXfig/xpath.xml b/ws/Docbook/Extensions/Tdata/Scale/FormatXfig/xpath.xml
index 4267fc53153a3171fbccbcfb30bb6b60d91f566f..501ac05295addb781ccbf036d611d6305664e2a9 100644
--- a/ws/Docbook/Extensions/Tdata/Scale/FormatXfig/xpath.xml
+++ b/ws/Docbook/Extensions/Tdata/Scale/FormatXfig/xpath.xml
@@ -11,6 +11,16 @@
          xmlns:db="http://docbook.org/ns/docbook">
   <title>Images</title>
 
+  <figure xml:id="fig_animatedStack">
+    <title>Animated stack</title>
+
+    <mediaobject>
+      <imageobject>
+        <imagedata fileref="Ref/stack.multi.svg"/>
+      </imageobject>
+    </mediaobject>
+  </figure>
+
   <figure xml:id="sd1VideoUsingScannerClass">
     <title>Using a <classname
     xlink:href="https://docs.oracle.com/javase/8/docs/api/java/util/Scanner.html">Scanner</classname>
diff --git a/ws/Docbook/Preprocess/Xsl/docbookExtractFig.xsl b/ws/Docbook/Preprocess/Xsl/docbookExtractFig.xsl
index bca4cc94278b17253782422b247ff4dbe436aa3f..1f8ce93dc825fb36d20e455db1744714cde095f9 100644
--- a/ws/Docbook/Preprocess/Xsl/docbookExtractFig.xsl
+++ b/ws/Docbook/Preprocess/Xsl/docbookExtractFig.xsl
@@ -1,7 +1,10 @@
 <?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="http://docbook.org/ns/docbook" xmlns:d="http://docbook.org/ns/docbook">
+  xmlns:svg="http://www.w3.org/2000/svg"
+  xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+  xmlns:jessyink="https://launchpad.net/jessyink"
+  xmlns:d="http://docbook.org/ns/docbook">
   
   
   <xsl:import href="../../docbook-xsl/xhtml/chunk.xsl"/>
@@ -12,12 +15,14 @@
     
     <xsl:variable name="figFiles" select="//d:imagedata[ends-with(@fileref, '.fig') ]" />
     <xsl:variable name="pdfFiles" select="//d:imagedata[ends-with(@fileref, '.pdf') ]" />
+    <xsl:variable name="animatedSvgFiles" select="//d:imagedata[ends-with(@fileref, '.multi.svg') ]" />
     
     <xsl:apply-templates select="//d:imagedata[ends-with(@fileref, '.fig') ]" mode="printLatex"/>
+    <xsl:apply-templates select="$animatedSvgFiles" mode="sortLayer"/>
     
     <xsl:result-document method="text" encoding="utf-8" href="mediaobjects.list" >
       <xsl:text>all: </xsl:text>
-      
+          
       <xsl:for-each select="$figFiles">
         <xsl:call-template name="relative-uri">
           <xsl:with-param name="destdir">
@@ -57,8 +62,85 @@
       </xsl:for-each>
       
     </xsl:result-document>
+  </xsl:template>  
+  
+  <xsl:template match="d:imagedata" mode="sortLayer">
+    <xsl:variable name="svgMulti" select="document(@fileref, .)"/>
+    
+    <xsl:value-of select="@fileref"/>
+    <xsl:text>.files </xsl:text>
+    
+    
+    <xsl:apply-templates select="$svgMulti/svg:svg" mode="sortLayer">
+      <xsl:with-param name="svgMultiBasename">
+        <xsl:call-template name="hdm.get.leftmost.of.separator">
+          <xsl:with-param name="path">
+            
+              <xsl:if test="ancestor::*/@xml:base">
+                <xsl:call-template name="hdm.get.leftmost.of.separator">
+                  <xsl:with-param name="path" select="ancestor::*/@xml:base"/>
+                  <xsl:with-param name="separator" select="'/'"/>
+                </xsl:call-template>
+                <xsl:text>/</xsl:text>
+              </xsl:if>
+            <xsl:value-of select="@fileref"/>
+            
+          </xsl:with-param>
+          <xsl:with-param name="separator" select="'.multi.svg'"/>
+        </xsl:call-template>
+      </xsl:with-param>
+      <xsl:with-param name="svgRoot" select="$svgMulti/svg:svg"/>
+    </xsl:apply-templates>
+    
+  </xsl:template>
+  
+  <xsl:template match="svg:svg" mode="sortLayer">
+    <xsl:param name="svgMultiBasename"/>
+    <xsl:param name="svgRoot"/>
+    <xsl:variable name="masterSlide" select="svg:g[@jessyink:masterSlide]"/>
+    
+    <xsl:variable name="displayLayers" select="svg:g[not(@jessyink:masterSlide)]"/>
+        
+    <xsl:result-document href="{$svgMultiBasename}.filenames" exclude-result-prefixes="#all" indent="yes">
+      <start>
+        <xsl:for-each select="$displayLayers">
+          <xsl:sort select="@inkscape:label"/>
+          <xsl:variable name="svgLayerBasefilename">
+            <xsl:value-of select="$svgMultiBasename"/>
+            <xsl:text>-</xsl:text>
+            <xsl:value-of select="position() - 1"/>
+          </xsl:variable>
+          <file>
+            <xsl:value-of select="$svgLayerBasefilename"/>
+          </file>
+          <xsl:result-document href="{$svgLayerBasefilename}.svg" exclude-result-prefixes="svg">
+            <svg xmlns="http://www.w3.org/2000/svg">
+              <xsl:copy-of select="$svgRoot/@*" />
+              <xsl:copy-of select="$svgRoot/*[not (name(.) = 'g')]"/>
+              <xsl:copy-of select="$masterSlide"/>
+              <xsl:apply-templates select="." mode="sortLayer"/>
+            </svg>
+          </xsl:result-document>
+        </xsl:for-each>
+      </start>
+    </xsl:result-document>
   </xsl:template>
   
+  <xsl:template match="svg:g" mode="sortLayer">
+    <svg:g>
+      <xsl:copy-of select="@*[not(name(.)='style')]|*"/>      
+    </svg:g>
+  </xsl:template>
+
+  <xsl:template match="*" mode="sortLayer">
+    <xsl:message>
+      <xsl:text>Error: No template defined for element '</xsl:text>
+      <xsl:value-of select="name(.)"/>
+      <xsl:text>' in mode sortLayer</xsl:text>
+    </xsl:message>
+  </xsl:template>
+  
+  
   <xsl:template match="d:imagedata" mode="printLatex">
     
     <xsl:variable name="dirPath">
diff --git a/ws/Docbook/Preprocess/make.rules b/ws/Docbook/Preprocess/make.rules
index 77e19d6fce51e53afab402f4ee3e107d250b8d5f..10aa2bbab24a5552cd14025b9885377f08b84551 100644
--- a/ws/Docbook/Preprocess/make.rules
+++ b/ws/Docbook/Preprocess/make.rules
@@ -99,8 +99,8 @@ SAXONCMD=java -cp "${DBOOK_XSL}/tools/lib/saxon9he.jar:/usr/share/java/xercesImp
            -xsl:${DBOOK_XSL_PREPROCESS}/Xsl/docbook2slide.xsl > ${*}.slide.xml
 	 ${SAXONCMD} -s:$*.xml \
             -xsl:${DBOOK_XSL_PREPROCESS}/Xsl/docbook2print.xsl > ${*}.print.xml
-	cd  $(@D); ${SAXONCMD} -s:$(<F) -xsl:${DBOOK_XSL_PREPROCESS}/Xsl/docbookExtractFig.xsl
 	tar cv- `find . -name Ref -and -type d|grep -v ^\./target`|tar -x -C $(@D) || echo
+	cd  $(@D); ${SAXONCMD} -s:$(<F) -xsl:${DBOOK_XSL_PREPROCESS}/Xsl/docbookExtractFig.xsl
 	cp -f ${DBOOK_XSL_PREPROCESS}/make.image ${DBOOK_XSL_PREPROCESS}/docbooksupplement.js $(@D)
 	cd  $(@D); $(MAKE) -j ${numCores} -f make.image;# rm -rf `find . -name Generate`