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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.

Thus, to use the text box value to call the web service, you would use the button click event handler that was created earlier:

6

TIP The <description> element is a child of many of the tags in the portlet deployment descriptor. Its use is optional, but it is very handy for documentation or portlet deployment tools.

The schema needs to have the <employees> root element that can contain one or more <employee> elements. The root element is defined as follows:

function btnLookup_onclick() { var strCC = document.all("txtCC").value;; DataService.GetCountryForRegion(strCC, onReturn, onTimeOut); }

The <portlet-name> element is required for the portlet. Each portlet s name in the portlet application has to be unique. This name should not contain any spaces or non-web-friendly special characters. The <display-name> element provides a human-readable name for portal administration tools. It is optional. The class name of the portlet belongs in the <portlet-class> element, which takes a fully qualified Java class name, as shown here:

//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.

In JavaScript, you use document.all to look up an HTML control, pass it the ID of the control, and query its properties. So, the first line in this JavaScript takes the value of the text box and loads it into the strCC var. Now all that remains is to implement the onReturn and onTimeOut functions. These are standard JavaScript functions that take a result parameter. You can see them here:

<portlet> <description>Preferences Validation Portlet</description> <portlet-name>PreferencesValidationPortlet</portlet-name> <display-name>Preferences Validation Portlet</display-name> <portlet-class> com.portalbook.portlets.PreferencesValidationPortlet</portlet-class> .... </portlet>

Each portlet may have zero or more portlet initialization parameters, which are used to provide configuration information for all users. The <init-param> element (see Figure 6-3) has three child elements: <description>, <name>, and <value>. The <name> and <value> elements are required. For more on initialization parameters, see 7.

function onReturn(result) { CC.innerHTML = result; } function onTimeOut(result) { alert("You hit a timeout!"); }

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.

6

The result that a successful call to the web service returns is a string, so you can set the innerHTML of the <div> to this result and it will appear on the page. And that s it you now have a pure thin-client web application that directly consumes a web service via JavaScript-based proxies! You can see this application in action in Figure 12-21.

Now that we have created and compiled the schema, it is ready to be written to disk: XmlTextWriter writer = new XmlTextWriter(textBox1.Text,null); schema.Write(writer); writer.Close(); The Write() method of the XmlSchema class writes the schema to a stream and has many overloads. We used one that accepts an XmlWriter pointing to the desired file. After the writing operation is over, the XmlWriter is closed. That s it! You just created a complete schema using the SOM. You can run the application and see how the schema is generated. Figure 5-13 shows the resultant schema.

<init-param> <name>indexPath</name> <value>/java/index</value> </init-param> <init-param> <name>repository</name> <value>engineering</value> </init-param>

Summary