c# code 39 generator CH AP T ER 5 VA LI D AT IN G X ML D OC UMEN TS in Visual C#.NET

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//define employeeid attribute XmlSchemaAttribute employeeid = new XmlSchemaAttribute(); employeeid.Name = "employeeid"; employeeid.SchemaTypeName = new XmlQualifiedName("int", "http://www.w3.org/2001/XMLSchema"); employeeid.Use = XmlSchemaUse.Required; employeetype.Attributes.Add(employeeid); //define top complex type XmlSchemaComplexType complextype = new XmlSchemaComplexType(); XmlSchemaSequence sq = new XmlSchemaSequence(); XmlSchemaElement employee = new XmlSchemaElement(); employee.Name = "employee"; employee.SchemaType = employeetype; employee.MinOccurs = 0; employee.MaxOccursString = "unbounded"; sq.Items.Add(employee); complextype.Particle = sq; //define <employees> element XmlSchemaElement employees = new XmlSchemaElement(); employees.Name = "employees"; employees.SchemaType = complextype; schema.Items.Add(employees); //compile the schema XmlSchemaSet set = new XmlSchemaSet(); set.Add(schema); set.Compile(); //save the schema XmlTextWriter writer = new XmlTextWriter(textBox1.Text,null); schema.Write(writer); writer.Close(); MessageBox.Show("Schema Created Successfully!"); } The code is a bit lengthy and hence we will dissect it in pieces.
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Creating the Schema
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An in-memory schema is represented by the XmlSchema class. The code declares an instance of XmlSchema at the top: XmlSchema schema = new XmlSchema();
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CHAPTER 5 VA LIDATIN G XML DOCUMEN TS
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Creating a Simple Type for Names
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The schema needs to define a simple type for names. This is defined next: XmlSchemaSimpleType nametype = new XmlSchemaSimpleType(); XmlSchemaSimpleTypeRestriction nameRes = new XmlSchemaSimpleTypeRestriction(); nameRes.BaseTypeName = new XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema"); XmlSchemaMinLengthFacet nameFacet1 = new XmlSchemaMinLengthFacet(); nameFacet1.Value = "3"; XmlSchemaMaxLengthFacet nameFacet2 = new XmlSchemaMaxLengthFacet(); nameFacet2.Value = "255"; nameRes.Facets.Add(nameFacet1); nameRes.Facets.Add(nameFacet2); nametype.Content = nameRes; A simple type is represented by the XmlSchemaSimpleType class. The simple type for names has certain restrictions: The data type must be a string. The minimum length must be 3. The maximum length must not exceed 255. To represent these restrictions, an instance of the XmlSchemaSimpleTypeRestriction class is created. The XmlSchemaSimpleTypeRestriction class s BaseTypeName property, which is of type XmlQualifiedName, specifies the base data type used by this restriction. The XmlQualifiedName class can be used to represent built-in XSD data types such as string and int. In our example, we need string and hence we pass it as the first parameter of the constructor. The second parameter indicates the namespace to which the data type belongs. The minimum and maximum length restrictions can be enforced by facet classes. The two facet classes we need are XmlSchemaMinLengthFacet and XmlSchemaMaxLengthFacet. These facet classes inherit from the XmlSchemaFacet base class and represent the minimum length and maximum length of the simple type, respectively, indicated by the Value property of each class. The facets are then added to the XmlSchemaSimpleTypeRestriction instance by using its Add() method. Finally, the Content property of the XmlSchemaSimpleType object is set to the restriction we created.
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Creating a Simple Type for Phone Numbers
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Creating a simple type for phone numbers follows the same procedure as discussed earlier. However, the restriction requirements are slightly different. The relevant code is shown here: XmlSchemaSimpleType phonetype = new XmlSchemaSimpleType(); XmlSchemaSimpleTypeRestriction phoneRes = new XmlSchemaSimpleTypeRestriction(); phoneRes.BaseTypeName = new XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema"); XmlSchemaMaxLengthFacet phoneFacet1 = new XmlSchemaMaxLengthFacet(); phoneFacet1.Value = "20"; phoneRes.Facets.Add(phoneFacet1); phonetype.Content = phoneRes;
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CH AP T ER 5 VA LI D AT IN G X ML D OC UMEN TS
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As before, instances of XmlSchemaSimpleType and XmlSchemaSimpleTypeRestriction are created. This time we need only one facet for specifying the maximum length of the phone number. Thus the code declares an instance of XmlSchemaMaxLengthFacet class and sets its Value property to 20. As before, the facet is added to the restriction, and the Content property of the XmlSchemaSimpleType instance is set to the phone number restriction.
Creating a Simple Type for Notes
Creating a simple type for notes is the same as I discussed earlier. The only change is in the maximum length value. The relevant code is shown here: XmlSchemaMaxLengthFacet notesFacet1 = new XmlSchemaMaxLengthFacet(); notesFacet1.Value = "500";
Creating a Complex Type That Represents an Employee
A complex type is represented by the XmlSchemaComplexType class. In our example, the four subelements (<firstname>, <lastname>, <homephone>, and <notes>) must appear in the same sequence, which is defined by the XmlSchemaSequence class. The code that defines the complex type is shown here: XmlSchemaComplexType employeetype = new XmlSchemaComplexType(); XmlSchemaSequence sequence = new XmlSchemaSequence(); XmlSchemaElement firstname = new XmlSchemaElement(); firstname.Name = "firstname"; firstname.SchemaType = nametype; XmlSchemaElement lastname = new XmlSchemaElement(); lastname.Name = "lastname"; lastname.SchemaType = nametype; XmlSchemaElement homephone = new XmlSchemaElement(); homephone.Name = "homephone"; homephone.SchemaType = phonetype; XmlSchemaElement notes = new XmlSchemaElement(); notes.Name = "notes"; notes.SchemaType = notestype; sequence.Items.Add(firstname); sequence.Items.Add(lastname); sequence.Items.Add(homephone); sequence.Items.Add(notes); employeetype.Particle = sequence; //define employeeid attribute XmlSchemaAttribute employeeid = new XmlSchemaAttribute(); employeeid.Name = "employeeid"; employeeid.SchemaTypeName = new XmlQualifiedName("int", "http://www.w3.org/2001/XMLSchema"); employeeid.Use = XmlSchemaUse.Required; employeetype.Attributes.Add(employeeid);
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