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CHAPTER 5 VA LIDATIN G XML DOCUMEN TS
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This section of the code starts by declaring instances of the XmlSchemaComplexType and XmlSchemaSequence classes. Next we need four elements. Each is defined by an XmlSchemaElement class and should assume one of the simple types defined earlier. The Name property of the XmlSchemaElement class specifies the name of the element; the SchemaType property specifies the data type of the element and can be set to a simple type or a complex type. After all four elements are defined, they are added to the XmlSchemaSequence object by using its Add() method. After the sequence instance is ready, you need to set the Particle property of the XmlSchemaComplexType object to it. The Particle property specifies the compositor type of the complex type, and an attribute of a complex type is represented by the XmlSchemaAttribute class. The Name property of XmlSchemaAttribute specifies the name of the attribute. The data type of the attribute is specified by using the SchemaTypeName property, which is of type XmlQualifiedName. In our case, the employeeid attribute is an integer and hence the XmlQualifiedName uses int as the data type. The Use property of the XmlSchemaAttribute class indicates how the attribute is used in the XML document. This property is an enumeration of type XmlSchemaUse. In our case, the employeeid attribute is mandatory and hence we set the Use property to Required.
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Creating a Top-Level Complex Type
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The root element of our XML document needs to have zero or more instances of the <employee> element, which is of the complex type we defined in the previous section. To represent the <employee> element, we define it as another complex type, as shown here: 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; The code creates an instance of the XmlSchemaComplexType and XmlSchemaSequence classes as before. This time it creates a single XmlSchemaElement to represent an <employee> element. This element is of type employeetype (the complex type we defined in the previous section). The MinOccurs property of the XmlSchemaElement class indicates the minimum number of times the element must appear in the document. Along the same lines, the MaxOccursString property indicates the maximum permissible instances of the element. Note that this property accepts numbers as a string. If there is no restriction on the number, you can set it to unbounded. After the element is created, it is added to the sequence, and the sequence is assigned to the Particle property of the XmlSchemaComplexType class.
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Creating the Root Element
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The schema needs to have the <employees> root element that can contain one or more <employee> elements. The root element is defined as follows:
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//define <employees> element XmlSchemaElement employees = new XmlSchemaElement(); employees.Name = "employees"; employees.SchemaType = complextype; As before, an instance of XmlSchemaElement is created. Its Name property is set to employees, and its SchemaType property is set to the top-level complex type we created in the previous section.
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Compiling the Schema
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Now we have completed all the simple types, complex types, and attributes. We can now add the root element to the schema. This is done by using the Add() method of the Items collection of the XmlSchema class: schema.Items.Add(employees); After the schema is ready, you can compile it. Compiling the schema ensures that the schema is syntactically correct and well formed. The XmlSchemaSet class represents a set of schemas and allows you to compile them. The relevant code is given here: //compile the schema try { XmlSchemaSet set = new XmlSchemaSet(); set.Add(schema); set.Compile(); } catch (Exception ex) { MessageBox.Show("Schema compilation failed"); return; } The Add() method of the XmlSchemaSet class accepts the XmlSchema objects that are to be added to the schema set. The Compile() method of the XmlSchemaSet class compiles all the schemas in the given set.
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