diff --git a/Doc/Common/glossary.xml b/Doc/Common/glossary.xml
index e8d26fb0dd5e7e7cd33ff421a2b8f91113805be2..3c3dee31b4446e8e67b5b550d4864eea08cce6a9 100644
--- a/Doc/Common/glossary.xml
+++ b/Doc/Common/glossary.xml
@@ -626,7 +626,7 @@
       <glossterm><acronym>SVG</acronym></glossterm>
 
       <glossdef>
-        <para><link xlink:href="http://www.w3schools.com/svg">Scalable Vector
+        <para><link xlink:href="http://www.w3schools.com/graphics/svg_intro.asp">Scalable Vector
         Graphics</link></para>
       </glossdef>
     </glossentry>
diff --git a/Doc/Sd1/objectsClasses.xml b/Doc/Sd1/objectsClasses.xml
index fd30969464330923bf047cb69b80003313d9c43f..b94d2895aaf4d2165ca4e396c952afa89e5d4582 100644
--- a/Doc/Sd1/objectsClasses.xml
+++ b/Doc/Sd1/objectsClasses.xml
@@ -1182,11 +1182,11 @@ public class Circle {
                     <glossdef>
                       <para>We would like Rectangle and Circle instances to be
                       visualized as <xref linkend="glo_SVG"/> graphics. <link
-                      xlink:href="http://www.w3schools.com/svg/svg_examples.asp">SVG
+                      xlink:href="http://www.w3schools.com/graphics/svg_examples.asp">SVG
                       Examples</link> provides editor samples both for <link
-                      xlink:href="http://www.w3schools.com/svg/tryit.asp?filename=trysvg_circle">circles</link>
+                      xlink:href="http://www.w3schools.com/graphics/svg_circle.asp">circles</link>
                       and <link
-                      xlink:href="http://www.w3schools.com/svg/tryit.asp?filename=trysvg_rect">rectangles</link>.
+                      xlink:href="http://www.w3schools.com/graphics/svg_rect.asp">rectangles</link>.
                       Add a method <methodname>void writeSvg()</methodname> to
                       both of your classes which allows for <xref
                       linkend="glo_SVG"/> code being written to standard
diff --git a/Doc/Sda1/schema.xml b/Doc/Sda1/schema.xml
index e7d18682d21ea9e519e14f284d4801dd706c73a8..de435e23b18ca31b21e55170c0e0252fedba0cb2 100644
--- a/Doc/Sda1/schema.xml
+++ b/Doc/Sda1/schema.xml
@@ -636,7 +636,7 @@ WHERE ID=1</programlisting>
                 <para>Hints: Regarding a track's time data type look for the
                 heading <quote><emphasis role="bold">Duration Data
                 Type</emphasis></quote> in <link
-                xlink:href="http://www.w3schools.com/schema/schema_dtypes_date.asp">http://www.w3schools.com/schema/schema_dtypes_date.asp</link>
+                xlink:href="http://www.w3schools.com/xml/schema_dtypes_date.asp">http://www.w3schools.com/xml/schema_dtypes_date.asp</link>
                 and consider the corresponding reference definition in <link
                 xlink:href="https://www.w3.org/TR/xmlschema11-2/#duration">http://www.w3.org/TR/xmlschema11-2</link>.</para>
               </question>
diff --git a/Doc/Sda1/xmlschema.xml b/Doc/Sda1/xmlschema.xml
index e43bfc7b7a1c7b943a65c723280074f3a80fdbcd..4214211ec64c8f0723b9675ab7c8004aef45689b 100644
--- a/Doc/Sda1/xmlschema.xml
+++ b/Doc/Sda1/xmlschema.xml
@@ -18,7 +18,7 @@
       </listitem>
 
       <listitem>
-        <para><link xlink:href="http://www.w3schools.com/schema">XML Schema
+        <para><link xlink:href="http://www.w3schools.com/xml/schema_intro.asp">XML Schema
         Tutorial</link></para>
       </listitem>
     </itemizedlist>
@@ -1409,7 +1409,7 @@ public class Memo {
                   <listitem>
                     <para>Within a <tag class="starttag">para</tag> we want to
                     be able to emphasize text passages (<link
-                    xlink:href="http://www.w3schools.com/schema/schema_complex_mixed.asp">mixed
+                    xlink:href="http://www.w3schools.com/xml/schema_complex_mixed.asp">mixed
                     content</link>).</para>
                   </listitem>
                 </itemizedlist>