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When you build connectable applications, you ll often be faced with the need to make your application talk to others that aren t built on the same APIs or technology. Consider the plumbing necessary to get a .NET Remoting application to talk to PHP, for example! Standards-based interoperability is a core design tenet of WCF. Using WCF allows you to quickly build services that use the advanced Web Services protocols (WS-*) this way, developers of applications that use other platforms can use the frameworks that implement the same standards on their platforms to talk to yours. It also allows you to easily upgrade your existing services and applications to use these standards, so you have a smooth glide path to upgrade your existing assets to standards-based interoperability. Finally, as new standards emerge, updates to the framework will become available, allowing you to use the standards with the peace of mind that Microsoft is supporting you. Any strategy for interoperability has two facets. The first is cross-platform interoperability, which is defined as support for communication between WCF and services built on non-Microsoft platforms. The strategy for this is to support the Web Services specifications extensively. The second is integration, which is defined as how WCF services will communicate with existing applications built on the Microsoft stack, including, for example, ASMX or Enterprise Services. At the heart of cross-platform interoperability is the support for the suite of Web Services standards, typically called WS-*. Three of the most important of these are WS-Security, WS-ReliableMessaging, and WS-Transactions, which provide for the secure, reliable, transactable services that are at the heart of WCF. You can see how these work in the abstract architecture diagram in Figure 7-2.

Figure 13-10. Application to demonstrate white space handling The application loads the Employees.xml file when you click the Load button. The Preserve White Spaces check box indicates whether we wish to preserve white spaces during document loading and saving. The Click event handler of the Load button is shown in Listing 13-20. Listing 13-20. Using LoadOptions and SaveOptions Enumerations private void button1_Click(object sender, EventArgs e) { XElement root = null; string path=Application.StartupPath + @"\employees.xml"; if (!checkBox1.Checked) { root=XElement.Load(path, LoadOptions.None); MessageBox.Show(root.ToString()); root.Save(path, SaveOptions.None); } else { root=XElement.Load(path, LoadOptions.PreserveWhitespace); MessageBox.Show(root.ToString()); root.Save(path, SaveOptions.DisableFormatting); } }

this code goes to that host and searches the link (if we re allowed):

WS-Security is a set of enhancements to SOAP that allow you to specify how a message can be secured when being passed to and from a service. It can ensure that the message isn t tampered with, and that sensitive information, such as a password, is encrypted. The message is protected through authentication, confidentiality, and assurance of integrity. The original specification for WS-Security was drawn up by OASIS (Organization for the Advancement of Structured Information Standards), and is available at www.oasis-open.org.

The code loads the Employees.xml file into an instance of the XElement class. Depending on the check box state, it decides the appropriate LoadOptions value. The value of None indicates that we do not intend to preserve insignificant white spaces, where the value of PreserveWhitespace indicates that we wish to preserve white spaces. Similarly, while saving the document back to the disk, the SaveOptions value governs the white space behavior. The value of None indicates that the document will be indented, and insignificant white spaces will not be preserved, whereas the value of DisableFormatting indicates that we do not want to indent the document, and white spaces will be preserved as they are. The XML content loaded in the XElement are displayed in a message box using the ToString() method of the XElement class. Try running the application with the check box unchecked (see Figure 13-11) and checked (see Figure 13-12). Notice that the message box in Figure 13-12 has preserved the white spaces.

crawlNewHost(link); } else {

This code crawls the link:

WS-ReliableMessaging builds on WS-Reliability, which is a set of enhancements to SOAP designed to guarantee message reliability to and from a web service. It has guaranteed delivery and duplication elimination, as well as the facility to ensure that the ordering of messages is maintained. WS-ReliableMessaging expands on this to provide reliable message delivery between applications, and is not limited to SOAP and Web Services, making it ideal for integration with existing systems. WS-ReliableMessaging is an important next step in ensuring the reliability of message interchange between distributed applications in that it is designed to also maintain reliability characteristics in the presence of component, system, or network failures. It is transport-independent, allowing it to be implemented on network technologies and protocols other than SOAP, but a SOAP binding is also defined within its specification.