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diff --git a/Sda1/XmlSchema/xmlschema.xml b/Sda1/XmlSchema/xmlschema.xml
new file mode 100644
index 0000000000000000000000000000000000000000..396084d306f71e10c2e6ab8549db3e8a346b0189
--- /dev/null
+++ b/Sda1/XmlSchema/xmlschema.xml
@@ -0,0 +1,216 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<chapter annotations="slide" version="5.1" xml:id="sda1_xmlschema" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xila="http://www.w3.org/2001/XInclude/local-attributes" xmlns:xi="http://www.w3.org/2001/XInclude" xmlns:trans="http://docbook.org/ns/transclusion" xmlns:svg="http://www.w3.org/2000/svg" xmlns:m="http://www.w3.org/1998/Math/MathML" xmlns:html="http://www.w3.org/1999/xhtml" xmlns:db="http://docbook.org/ns/docbook">
+ <title>XML Schema</title>
+
+ <figure xml:id="sda1_xmlschema_recommendedReading">
+ <title>Recommended Reading</title>
+
+ <itemizedlist>
+ <listitem>
+ <para><xref linkend="bib_fawcett2012"/></para>
+ </listitem>
+
+ <listitem>
+ <para><xref linkend="bib_Walmsley02"/></para>
+ </listitem>
+
+ <listitem>
+ <para><link xlink:href="https://www.w3schools.com/xml/schema_intro.asp">XML Schema Tutorial</link></para>
+ </listitem>
+ </itemizedlist>
+ </figure>
+
+ <section xml:id="sda1_xmlschema_wellFormed">
+ <title>Well formed XML documents</title>
+
+ <para><xref linkend="glo_XML"/> allows for inventing arbitrary dialects. We consider an address database:</para>
+
+ <figure xml:id="sda1_xmlschema_inventDialect">
+ <title>Inventing an address format</title>
+
+ <programlisting language="xml"><?xml version="1.0" encoding="UTF-8"? > <co linkends="sda1_xmlschema_inventDialect-2" xml:id="sda1_xmlschema_inventDialect-2-co"/>
+<contacts> <co linkends="sda1_xmlschema_inventDialect-3" xml:id="sda1_xmlschema_inventDialect-3-co"/>
+ <person> <co linkends="sda1_xmlschema_inventDialect-4" xml:id="sda1_xmlschema_inventDialect-4-co"/>
+ <firstName>Jeff</firstName>
+ <lastName>Smith</lastName>
+ <mail>jeff@smith.com</mail>
+ <birth day="22" <co linkends="sda1_xmlschema_inventDialect-5" xml:id="sda1_xmlschema_inventDialect-5-co"/> month="11" year="1997"/>
+ </person>
+ ...
+</contacts></programlisting>
+ </figure>
+
+ <para>We explain some conventions:</para>
+
+ <calloutlist>
+ <callout arearefs="sda1_xmlschema_inventDialect-2-co" xml:id="sda1_xmlschema_inventDialect-2">
+ <para>Optional header providing the documents <xref linkend="glo_XML"/> compatibility version and its internal font encoding.</para>
+ </callout>
+
+ <callout arearefs="sda1_xmlschema_inventDialect-3-co" xml:id="sda1_xmlschema_inventDialect-3">
+ <para>The documents unique root element. <tag class="starttag">contacts</tag> does have exactly one child element <tag class="starttag">person</tag>.</para>
+ </callout>
+
+ <callout arearefs="sda1_xmlschema_inventDialect-4-co" xml:id="sda1_xmlschema_inventDialect-4">
+ <para>The <tag class="starttag">person</tag> element has got the parent element <tag class="starttag">contacts</tag>. It also has got three child elements (or children for short) <tag class="starttag">firstName</tag>, <tag class="starttag">lastName</tag> and <tag class="starttag">birth</tag>.</para>
+ </callout>
+
+ <callout arearefs="sda1_xmlschema_inventDialect-5-co" xml:id="sda1_xmlschema_inventDialect-5">
+ <para>Like its predecessors <tag class="starttag">firstName</tag> and <tag class="starttag">lastName</tag> the element <tag class="starttag">birth</tag> is said to have <tag class="starttag">person</tag> as its parent element. In addition <tag class="starttag">birth</tag> does have three attributes <property>day</property>, <property>month</property> and <property>year</property>.</para>
+
+ <para>Attribute names must be unique within a given element's scope. Consider the following <xref linkend="glo_Java"/> class analogy:</para>
+
+ <programlisting language="java">public class Birth {
+ int day=22, month=11, year=1997;
+ ...
+}</programlisting>
+ </callout>
+ </calloutlist>
+
+ <figure xml:id="sda1_xmlschema_wellFormed_Constraints">
+ <title>Constraints of well- formedness</title>
+
+ <itemizedlist>
+ <listitem>
+ <para>Specification <link xlink:href="https://www.w3.org/TR/2006/REC-xml-20060816/#sec-well-formed">at W3C</link>.</para>
+ </listitem>
+
+ <listitem>
+ <para/>
+ </listitem>
+ </itemizedlist>
+ </figure>
+
+ <figure xml:id="sda1_xmlschema_wellFormed_nesting">
+ <title>Proper nesting</title>
+
+ <mediaobject>
+ <imageobject>
+ <imagedata fileref="Ref/Fig/wellformedProperNesting.svg"/>
+ </imageobject>
+ </mediaobject>
+ </figure>
+
+ <figure xml:id="sda1_xmlschema_wellFormed_quotes">
+ <title>Attribute quotes</title>
+
+ <mediaobject>
+ <imageobject>
+ <imagedata fileref="Ref/Fig/wellformedAttribQuote.svg"/>
+ </imageobject>
+ </mediaobject>
+ </figure>
+
+ <figure xml:id="sda1_xmlschema_wellFormed_oneRoot">
+ <title>Exactly one root element</title>
+
+ <glosslist>
+ <glossentry>
+ <glossterm>Correct: Exactly one root element</glossterm>
+
+ <glossdef>
+ <programlisting language="xml"><iAmRootElement/></programlisting>
+ </glossdef>
+ </glossentry>
+
+ <glossentry>
+ <glossterm>Wrong: Two root elements</glossterm>
+
+ <glossdef>
+ <programlisting language="xml"><iAmRootElement/>
+<iAmYourSibling /></programlisting>
+ </glossdef>
+ </glossentry>
+
+ <glossentry>
+ <glossterm>Wrong: No root element at all</glossterm>
+
+ <glossdef>
+ <programlisting language="xml"><?xml version="1.0" encoding="UTF-8"? >
+<!-- Noting here but a lousy comment! --></programlisting>
+ </glossdef>
+ </glossentry>
+ </glosslist>
+ </figure>
+
+ <figure xml:id="sda1_xmlschema_wellFormed_attribNameUnique">
+ <title>Unique attribute names</title>
+
+ <glosslist>
+ <glossentry>
+ <glossterm>Correct: unique attribute names within an element's scope </glossterm>
+
+ <glossdef>
+ <programlisting language="xml"><meeting day="22" hour="4 PM"/></programlisting>
+ </glossdef>
+ </glossentry>
+
+ <glossentry>
+ <glossterm>Wrong: Duplicate attribute names within an element's scope </glossterm>
+
+ <glossdef>
+ <programlisting language="xml"><meeting day="22" hour="4 PM" day="22"/></programlisting>
+ </glossdef>
+ </glossentry>
+ </glosslist>
+
+ <para>See <link xlink:href="https://www.w3.org/TR/2006/REC-xml-20060816/#uniqattspec">W3C specification</link>.</para>
+ </figure>
+
+ <figure xml:id="sda1_xmlschema_wellFormed_attribNoOpenBracket">
+ <title>Attribute value disallows <quote><</quote></title>
+
+ <programlisting language="xml"><boolean term="2 < 3" /></programlisting>
+
+ <para>Parser error: <code>The value of attribute "term" associated with an element type "boolean" must not contain the '<' character.</code></para>
+
+ <para>See <link xlink:href="https://www.w3.org/TR/2006/REC-xml-20060816/#CleanAttrVals">W3C specification</link>.</para>
+ </figure>
+
+ <qandaset defaultlabel="qanda" xml:id="sda1_qanda_xmlschema_wellFormed_attribNoOpenBracket">
+ <title>Legal attribute values</title>
+
+ <qandadiv>
+ <qandaentry>
+ <question>
+ <para>What about <quote>></quote> in attribute values? Set up a test file and let your parser of choice doing the work.</para>
+
+ <tip>
+ <para>The Oxygen XML <xref linkend="glo_IDE"/>'s icon:</para>
+ </tip>
+
+ <mediaobject>
+ <imageobjectco>
+ <areaspec otherunits="imagemap" units="other">
+ <area coords="-3,255,189,301" linkends="sda1_co_xmlschema_wellFormed_attribNoOpenBracket-1" xml:id="sda1_co_xmlschema_wellFormed_attribNoOpenBracket-1-co"/>
+
+ <area coords="33,142,364,175" linkends="sda1_co_xmlschema_wellFormed_attribNoOpenBracket-2" xml:id="sda1_co_xmlschema_wellFormed_attribNoOpenBracket-2-co"/>
+
+ <area coords="0,50,42,93" linkends="sda1_co_xmlschema_wellFormed_attribNoOpenBracket-3" xml:id="sda1_co_xmlschema_wellFormed_attribNoOpenBracket-3-co"/>
+ </areaspec>
+
+ <imageobject>
+ <imagedata fileref="Ref/Fig/oxygenCheckWellformed.png"/>
+ </imageobject>
+
+ <calloutlist>
+ <callout arearefs="sda1_co_xmlschema_wellFormed_attribNoOpenBracket-1-co" xml:id="sda1_co_xmlschema_wellFormed_attribNoOpenBracket-1">
+ <para>Icon checking for well-formedness and validity.</para>
+ </callout>
+
+ <callout arearefs="sda1_co_xmlschema_wellFormed_attribNoOpenBracket-2-co" xml:id="sda1_co_xmlschema_wellFormed_attribNoOpenBracket-2">
+ <para>Sub menu choosing between checking for well- formedness and validation.</para>
+ </callout>
+
+ <callout arearefs="sda1_co_xmlschema_wellFormed_attribNoOpenBracket-3-co" xml:id="sda1_co_xmlschema_wellFormed_attribNoOpenBracket-3">
+ <para>Result message well- formed / not well- formed or valid / not valid respectively.</para>
+ </callout>
+ </calloutlist>
+ </imageobjectco>
+ </mediaobject>
+ </question>
+ </qandaentry>
+ </qandadiv>
+ </qandaset>
+ </section>
+</chapter>
diff --git a/Sda1/sda1.xml b/Sda1/sda1.xml
new file mode 100644
index 0000000000000000000000000000000000000000..3ba2b025d53bfa04f98f0e8f29042e5a141c38e0
--- /dev/null
+++ b/Sda1/sda1.xml
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<book version="5.1" xmlns="http://docbook.org/ns/docbook"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
+ xmlns:xila="http://www.w3.org/2001/XInclude/local-attributes"
+ xmlns:xi="http://www.w3.org/2001/XInclude"
+ xmlns:trans="http://docbook.org/ns/transclusion"
+ xmlns:svg="http://www.w3.org/2000/svg"
+ xmlns:m="http://www.w3.org/1998/Math/MathML"
+ xmlns:html="http://www.w3.org/1999/xhtml"
+ xmlns:db="http://docbook.org/ns/docbook">
+ <info>
+ <title/>
+
+ <author>
+ <personname><firstname/><surname/></personname>
+
+ <affiliation>
+ <orgname/>
+ </affiliation>
+ </author>
+
+ <pubdate/>
+ </info>
+
+ <xi:include href="XmlSchema/xmlschema.xml" xpointer="element(/1)"/>
+
+ <xi:include href="../Doc/Common/bibliography.xml" xpointer="element(/1)"/>
+
+ <xi:include href="../Doc/Common/glossary.xml" xpointer="element(/1)"/>
+</book>