Figures
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Figure 2 Typical XML Schema Document
<xsd:schema 
    targetNamespace="uuid:048b2fa1-d557-473f-ba4c-acee78fe3f7d" 
    xmlns:target="uuid:048b2fa1-d557-473f-ba4c-acee78fe3f7d" 
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
>
    <xsd:complexType name="Person">
      <xsd:sequence>
        <xsd:choice>
          <xsd:element name="name" type="xsd:string"
                       xsi:nillable="true" />
          <xsd:element name="id" type="xsd:string" />
        </xsd:choice>
        <xsd:any processContents="lax"/>
      </xsd:sequence>
    </xsd:complexType>
    <xsd:complexType name="AgedPerson">
      <xsd:complexContent mixed="false">
        <xsd:extension base="target:Person">
          <xsd:choice>
            <xsd:element name="age" type="xsd:double" />
            <xsd:element name="timeOnEarth" type="xsd:double" />
          </xsd:choice>
        </xsd:extension>
      </xsd:complexContent>
    </xsd:complexType>
    <xsd:element name="don" type="target:Person" />
  </xsd:schema>
Figure 4 Schema Object Model Sample
using System;
using System.Xml;
using System.Xml.Serialization;
using System.Xml.Schema;

class som
{
  static readonly XmlQualifiedName xsd_string 
    = new XmlQualifiedName("string", XmlSchema.Namespace);
  static readonly XmlQualifiedName xsd_double 
    = new XmlQualifiedName("double", XmlSchema.Namespace);

  static void Main()
  {
    string targetNS = "uuid:048b2fa1-d557-473f-ba4c-acee78fe3f7d";

    XmlSchema schema = new XmlSchema();
    schema.TargetNamespace = targetNS;

// <xsd:element name="name" type="xsd:string" nillable="true" />
    XmlSchemaElement elem = new XmlSchemaElement();
    elem.Name = "name";
    elem.SchemaTypeName = xsd_string;
    elem.IsNillable = true;

// <xsd:element name="id" type="xsd:string" />
    XmlSchemaElement elem2 = new XmlSchemaElement();
    elem2.Name = "id";
    elem2.SchemaTypeName = xsd_string;

// <xsd:choice><xsd:element/><xsd:element/><xsd:choice>
    XmlSchemaChoice choice = new XmlSchemaChoice();
    choice.Items.Add(elem);
    choice.Items.Add(elem2);
 
// <xsd:sequence><xsd:choice/><xsd:any/></xsd:sequence>
    XmlSchemaSequence seq = new XmlSchemaSequence();
    seq.Items.Add(choice);
    seq.Items.Add(new XmlSchemaAny());

// <xsd:complexType><xsd:sequence/></xsd:complexType>
    XmlSchemaComplexType type = new XmlSchemaComplexType();
    type.Particle = seq;
    type.Name = "Person";
    schema.Items.Add(type);

// <xsd:element name="age" type="xsd:double" />
    elem = new XmlSchemaElement();
    elem.Name = "age";
    elem.SchemaTypeName = xsd_double;

// <xsd:element name="timeOnEarth" type="xsd:double" />
    elem2 = new XmlSchemaElement();
    elem2.Name = "timeOnEarth";
    elem2.SchemaTypeName = xsd_double; 

// <xsd:choice><xsd:element/><xsd:element/><xsd:choice>
    choice = new XmlSchemaChoice();
    choice.Items.Add(elem);
    choice.Items.Add(elem);

// <xsd:extension><xsd:choice/></xsd:extension>
    XmlSchemaComplexContentExtension content = new  
    XmlSchemaComplexContentExtension();
    content.Particle = choice;
    content.BaseTypeName = new XmlQualifiedName("Person", targetNS);

// <xsd:complexContent><xsd:extension/></xsd:complexContent>
    XmlSchemaComplexContent model = new XmlSchemaComplexContent();
    model.Content = content;

// <xsd:complexType><xsd:complexContent/></xsd:complexType>
    type = new XmlSchemaComplexType();
    type.ContentModel = model;
    type.Name = "AgedPerson";
    schema.Items.Add(type);

// <xsd:element />
    elem = new XmlSchemaElement();
    elem.Name = "don";
    elem.SchemaTypeName = new XmlQualifiedName("Person", targetNS);
    schema.Items.Add(elem);

// compile and spit out to stdout
    schema.Compile(null);
    XmlTextWriter writer = new XmlTextWriter(Console.Out);
    writer.Formatting = Formatting.Indented;
    schema.Write(writer);
  }
}
Figure 7 XMLSerializer Architecture

Figure 7 XMLSerializer Architecture
Figure 8 XmlSerializer (excerpt)
namespace System.Xml.Serialization {
    public class XmlSerializer {
// primary constructor
      public XmlSerializer(Type clrType);

// primary serialize/deserialize methods
      public void Serialize(XmlWriter writer, object obj);
      public object Deserialize(XmlReader reader);

// overloaded serialize/deserialize wrappers
      public void Serialize(TextWriter writer, object obj);
      public object Deserialize(TextReader reader);

      public void Serialize(Stream writer, object obj);
      public object Deserialize(Stream reader);
    }
}
Figure 9 XmlSerializer.Serialize Example
using System.Xml;
using System.Xml.Serialization;
using System.Text;

class MyWriter {
    static void
     WriteObjectToFile(Object obj, string fname) {
// open an XML output stream
      XmlWriter writer = new XmlTextWriter(fname, 
                                         Encoding.UTF8);
      try {
// create a serializer of the object's type
      XmlSerializer ser = new XmlSerializer(obj.GetType());
// write the object out to the XML stream
      ser.Serialize(writer, obj);
      }
      finally {
        writer.Close();
      }
    }
}
Figure 10 XmlSerializer.Deserialize Example
using System.Text;
using System.Xml;
using System.Xml.Serialization

class MyReader {
    static object 
    ReadObjectFromFile(Type type, string fname) {
      Object result = null;
// open an XML parser
      XmlReader reader = new XmlTextReader(fname);
      try {
// create a serializer for the type
        XmlSerializer ser = new XmlSerializer(type);
// read XML and create corresponding object
        result = ser.Deserialize(reader);
      }
      finally {
        reader.Close();
      }
    }
    return result;
}
Figure 13 [XmlRoot]/[XmlType] Parameters

Use
Parameter
Type
Description
R
ElementName
String
xsd:element/@name
T
TypeName
String
xsd:complexType/@name
R/T
Namespace
String
../xsd:schema/@targetNamespace
R
IsNullable
Boolean
xsd:element/@nillable
R
DataType
String
XSD Built-in Type Name
T
IncludeInSchema
Boolean
No corresponding XML type
Figure 14 [XmlRoot]/[XmlType] Example Output
<xsd:schema 
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns:target="abcdef"
    targetNamespace="abcdef"
>
    <xsd:complexType name="Robert" />
    <xsd:element name="Bobby" type="target:Robert" 
                 nillable="true" />

    <xsd:complexType name="Steve" />
    <xsd:element name="Stevie" type="target:Steve" 
                 nillable="true" />

    <xsd:complexType name="Donald" />
</xsd:schema>
<xsd:schema 
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns:foreign="abcdef"
    targetNamespace=""
>
    <xsd:import namespace="abcdef" />
    <xsd:element name="Don" type="foreign:Donald" 
                 nillable="true"/>
    <xsd:complexType name="Dave" />
    <xsd:element name="Dave" type="Dave" 
                 nillable="true" />
</xsd:schema>
Figure 16 XmlAttributeAttribute/XmlElementAttribute Parameters

Use
Parameter
Type
Description
E
ElementName
String
xsd:element/@name
A
AttributeName
String
xsd:attribute/@name
E/A
Form
XmlSchemaForm
@form
E/A
Namespace
String
@ref (combined with XXXName)
E/A
DataType
String
XSD Built-in Type Name
E
IsNullable
Boolean
xsd:element/@nillable
E
Type
Type
Explicitly allowed derived types
Figure 19 [XmlAttribute]/[XmlElement] Example
using System.Xml.Schema;
using System.Xml.Serialization;

[ XmlRoot(Name="writer", Namespace="abcdef") ]
[ XmlType(TypeName="Author", Namespace="abcdef") ]
public class Author {
    [ XmlElementAttribute("name", IsNullable=true,
                          Form=XmlSchemaForm.Qualified) ] 
    public string name;

    [ XmlElementAttribute("notbreathing", 
                          Form=XmlForm.Unqualified) ]
    public bool dead;

    [ XmlAttributeAttribute("rate") ]
    public double royaltyrate;

}
Figure 20 [XmlAttribute]/[XmlElement] Example Output
<xsd:schema 
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns:target="abcdef"
    targetNamespace="abcdef"
>
    <xsd:element name="writer" type="target:Author" />
    <xsd:complexType name="Author" >
      <xsd:sequence>
        <xsd:element name="name" type="xsd:string"
                     nillable="true"
               form="qualified" />
        <xsd:element name="notbreathing" 
               type="xsd:boolean"
        />
      </xsd:sequence>
      <xsd:attribute name="rate" type="xsd:double" />
    </xsd:complexType>
</xsd:schema>
Figure 21 [XmlEnum] Example Output
<xsd:schema 
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns:target="abcdef"
    targetNamespace="abcdef"
>
    <xsd:simpleType name="hair" >
      <xsd:restriction base="xsd:string" >
        <xsd:enumeration value="bald" />
        <xsd:enumeration value="short" />
        <xsd:enumeration value="medium" />
        <xsd:enumeration value="long" />
      </xsd:restriction>
    </xsd:simpleType>
</xsd:schema>
Figure 22 [XmlArrayItem] Example
using System.Xml.Schema;
using System.Xml.Serialization;

[ XmlType("company", Namespace="abcdef") ]
public class Company  {
    [ XmlArray("staff", 
               Form=XmlSchemaForm.Unqualified) ]
    [ XmlArrayItem("manager", 
                   typeof(Manager), 
                   Form=XmlSchemaForm.Unqualified) ]
    [ XmlArrayItem("clerk", 
                   typeof(Clerk), 
                   Form=XmlForm.Unqualified) ]
    public IEmployee[] Employees;
}
Figure 23 [XmlArrayItem] Example Output
<xsd:complexType name="Company" >
   <xsd:sequence>
    <xsd:element name="staff">
     <xsd:complexType>
      <xsd:sequence>
       <xsd:choice minOccurs="0" maxOccurs="unbounded">
        <xsd:element name="clerk" type="target:Clerk" /> 
        <xsd:element name="manager" type="target:Manager" /> 
       </xsd:choice>
      </xsd:sequence>
     </xsd:complexType>
    </xsd:element>
   </xsd:sequence>
</xsd:complexType>
Figure 24 UnknownAttribute Handler
using System.Xml.Serialization

public static void OnAttribute(Object sender, 
                               XmlAttributeEventArgs args) {
    string localName = args.Attr.LocalName;
    string nsuri = args.Attr.NamespaceURI;
    string msg = String.Format(
                    "Unrecognized attribute {1}:{0} (line {2})", 
                    localName, nsuri,  args.LineNumber);
    throw new Exception(msg);
}

public static object ReadObject(XmlSerializer ser,
                                XmlReader reader) {
    ser.UnknownAttribute += 
                   new XmlAttributeEventHandler(OnAttribute);
    return ser.Deserialize(reader);
}
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