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Listing 2-20. Understanding the Difference Between the XmlWhiteSpace and XmlSignificantWhiteSpace Classes < xml version="1.0" > <root> <fullname>Nancy Davolio</fullname> <address> 23143 Sagebrush Novi, MI 48375 USA </address> </root> In the markup shown in Listing 2-20, there are several white spaces. First, there are white spaces between tags such as <root>, <fullname>, and <address>. Remember that in XML, carriage returns and line feeds are also considered white spaces. These white spaces between various elements are used mainly to improve readability of the document and are represented by the XmlWhiteSpace class. Second, there are white spaces embedded within the content of the <address> node. For example, there is a carriage return and line feed after the text Novi as well as MI 48375. These white spaces are represented by the XmlSignificantWhiteSpace class.

public Object getAttribute(String name) public Enumeration getAttributeNames() public void removeAttribute(String name) public void setAttribute(String name, Object object)

AutoResetEvent waitHandle = new AutoResetEvent(false); workflowRuntime.WorkflowCompleted += delegate(object sender, WorkflowCompletedEventArgs e) {waitHandle.Set();}; workflowRuntime.WorkflowTerminated += delegate(object sender, WorkflowTerminatedEventArgs e) { Console.WriteLine(e.Exception.Message); waitHandle.Set(); }; WorkflowInstance instance = workflowRuntime.CreateWorkflow(typeof (FirstWorkflowApp.Workflow1)); instance.Start(); waitHandle.WaitOne(); } } } }

The concept of XML namespaces is analogous to .NET namespaces. XML namespaces allow you to identify elements as part of a single group (a namespace) by uniquely qualifying element and attribute names used in an XML document. Each namespace is identified by a Uniform Resource Identifier (URI). This allows developers to combine information from different data structures in a single XML document without causing ambiguity and confusion among element names. For example, assume that you have two XML fragments, one related to employees and another related to customers. Further assume that both fragments contain a tag called <name>. The problem is that when you mix them together, you have ambiguity for the <name> tag. XML namespaces come in handy in such situations. To see how .NET provides support for XML namespaces, we will modify Employees.xml as shown in Listing 2-21. Listing 2-21. XML Document with Namespaces < xml version="1.0" encoding="utf-8" > <!-- This is list of employees --> <emp:employees xmlns:emp="http://www.somedomain.com"> <emp:employee employeeid="1"> <emp:firstname>Nancy</emp:firstname> <emp:lastname>Davolio</emp:lastname> <emp:homephone>(206) 555-9857</emp:homephone>

These attributes are different from the request attributes, even though the method names are similar. Each portlet application on the portal has one portlet context that is independent of individual users and sessions. All users can access the portlet context attributes, and they are valid until the portal server shuts down. The request attributes are valid on an action request only while the request is being processed and only valid on a render request until the user sends another request to the portlet. In addition, portlet context attributes are only valid for the Java virtual machine they are running in. For portlet applications distributed across multiple servers, you will need to use another information store, such as a database.

This code creates the new instance of the WorkflowRuntime called workflowRuntime. With this, it creates a waitHandle that exits the workflow when set. It adds a couple of event handlers to execute when the workflow completes or is terminated. When the workflow completes, you simply set the waitHandle. When it terminates, you dump out the error message and then set the waitHandle. Next, it uses the workflowRuntime to create a WorkflowInstance. This instance is initialized with the workflow that you want to run, which in this case is called Workflow1 and is in the FirstWorkflowApp namespace. It will then start the instance, calling the waitOne method on the waitHandle. This locks activity until the waitHandle is set. Thus, when your application is run, the line instance.Start() kicks off the workflow sequence. This hits the CodeActivity node, which causes its ExecuteCode function to run. This function writes the text out to the console window and waits for a key to be pressed. When the key is pressed, the sequence moves to the next node, which is the end of the workflow. This causes the WorkflowCompleted event to fire, which sets the waitHandle, which in turn completes the waitOne method on the instance. At this point, the flow passes to the next line, which is the end of the application, so the application terminates.