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The XML Schema Definition tool is provided as xsd.exe and can be invoked from the Visual Studio command prompt. In the following sections, you will learn how to use this tool to create schemas from XML documents and assemblies. Creating the Schema from an XML Document Let s assume that you have the Employees.xml file with you and wish to create an XSD schema for it by using the xsd.exe command-line tool. To do so, first open the Visual Studio command prompt from the Visual Studio program group. Then enter the following command at the command prompt: xsd.exe "C:\Bipin\Pro XML\Employees.xml" /outputdir:"C:\Bipin\Pro XML" The first parameter is the path and filename of the XML file for which the schema is to be generated. The /outputdir switch specifies the folder where the resultant schema file should be created. After you invoke the command, you will find an .xsd file in the specified folder. By default the name of the schema file is the same as the XML filename. Listing 5-5 shows the schema generated by the tool. Listing 5-5. Schema Generated by the xsd.exe Tool < xml version="1.0" encoding="utf-8" > <xs:schema id="employees" xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata"> <xs:element name="employees" msdata:IsDataSet="true" msdata:UseCurrentLocale="true"> <xs:complexType> <xs:choice minOccurs="0" maxOccurs="unbounded"> <xs:element name="employee"> <xs:complexType> <xs:sequence> <xs:element name="firstname" type="xs:string" minOccurs="0" msdata:Ordinal="0" /> <xs:element name="lastname" type="xs:string" minOccurs="0" msdata:Ordinal="1" /> <xs:element name="homephone" type="xs:string" minOccurs="0" msdata:Ordinal="2" /> <xs:element name="notes" type="xs:string" minOccurs="0" msdata:Ordinal="3" /> </xs:sequence> <xs:attribute name="employeeid" type="xs:string" /> </xs:complexType> </xs:element> </xs:choice> </xs:complexType> </xs:element> </xs:schema>

<%@ page session="true" %> <%@ taglib uri='/WEB-INF/tld/portlet.tld' prefix='portlet'%> <%@ taglib uri="/WEB-INF/tld/c.tld" prefix="c" %> <%@ taglib uri="/WEB-INF/tld/fmt.tld" prefix="fmt" %> <%@ page import="java.util.*"%> <%@ page import="javax.servlet.jsp.jstl.core.LoopTagStatus"%> <table> <tr class="portlet-section-header"> <td class="portlet-section-header">Description</td>

For the next step, you should drag and drop the text boxes, button, and label into the panel that you just added. Once you ve done this, the source code of your page will look something like this:

As you can see, the resultant schema defines a root element called <employees>. The <employees> element can have zero or more occurrences of the <employee> element. The <employee> element is defined as a complex type and contains four subelements: <firstname>, <lastname>, <homephone>, and <notes>. The schema also states that the elements must occur in the same sequence (as indicated by the <sequence> tag). The employeeid attribute is also defined. You can customize the generated schema to suit your needs.

5

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="AddWIthUpdatePanel.aspx.cs" Inherits="Example2.AddWIthUpdatePanel" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>Untitled Page</title> </head> <body> <form id="form1" runat="server"> <div> <asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> <br /> <asp:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <asp:Panel ID="Panel1" runat="server" Height="88px" Width="388px"> <asp:TextBox ID="txtA" runat="server"></asp:TextBox><br /> <asp:TextBox ID="txtB" runat="server"></asp:TextBox><br /> <asp:Button ID="btnAdd" runat="server" OnClick="btnAdd_Click" Text="Add Em Up" /><br /> <asp:Label ID="lblAns" runat="server"></asp:Label></asp:Panel> </ContentTemplate> </asp:UpdatePanel> </div> </form> </body> </html>

<td>Priority</td> <td>Created Date</td> <td>Status</td> </tr> <c:forEach var="item" items="${ToDoList}" varStatus="status"> <% LoopTagStatus status = (LoopTagStatus) pageContext.getAttribute("status"); String itemId = Integer.toString(status.getCount() - 1); %> <tr> <td><c:out value="${item.description}"/></td> <td><c:out value="${item.priority}"/></td> <td><fmt:formatDate value="${item.submittedDate}" dateStyle="short"/></td> <td> <c:choose> <c:when test="${item.status}"> Complete <a href="<portlet:actionURL> <portlet:param name="COMMAND" value="MARK_UNFINISHED"/> <portlet:param name="ITEM_ID" value="<%=itemId%>"/> </portlet:actionURL>" >(change)</a> </c:when> <c:otherwise> Incomplete <a href="<portlet:actionURL> <portlet:param name="COMMAND" value="MARK_FINISHED"/> <portlet:param name="ITEM_ID" value="<%=itemId%>"/> </portlet:actionURL>" >(change)</a> </c:otherwise> </c:choose> </td> </tr> </c:forEach> </table> <form action="<portlet:actionURL> <portlet:param name="COMMAND" value="NEW"/> </portlet:actionURL>"

Note You can also invoke the xsd.exe tool at a standard command prompt. However, you need to specify the

And that s all you ll need to do to get this application to become an Ajax one. Run the application, and you ll see that when you run it, it no longer performs a full page refresh; it just does a partial Ajax-style one. You can see this in Figure 12-9.

method="post"> Description: <input type="text" size="30" name="DESCRIPTION"> <br> <input type="submit" text="Create"> </form>

The homePage.jsp page uses an item from the portlet session and the portlet action URL JSP tag in several places. We also used the JSTL to avoid JSP scriptlets as much as possible.

complete path of the xsd.exe tool while invoking it. Alternatively, you can first navigate to the installation folder of .NET where the tool is located and then invoke it. You can even add it to the PATH variable.

Now, the example of adding two numbers is all very good, but how does ASP.NET AJAX stack up when writing a more typical ASP.NET page for example, one that uses a DataGrid to bind to a back-end data source

Much of the Edit All Items page (editPage.jsp) is similar to the Home page we just discussed. We are going to cover the differences in this section. This page is displayed if the user selects the EDIT mode from the portal page s user interface.

Creating the Schema from an Assembly You might be wondering why we d need to create a schema from an assembly. This facility, however, comes in handy during XML serialization, during which you often serialize your classes on the wire by using XML format. Thus the XSD schema extracted from the assembly represents the structure of this serialized XML data.