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Figure 9-4 Initial HTML page In Figure 9-4, the HTML page has two text boxes and two buttons and is called an HTML form Implementing the Permutations pattern by using an HTML form is a challenge from a resource definition perspective Contrast the HTML form to a traditional HTML page When E B V N Mary Jane (for example) reads an e-mail entry, the Permutations pattern is applied on the contents of the e-mail entry The resource is the URL http://mydomaincom/mailbox/maryjane/ entry1234, and the representation is a transformation of the e-mail entry to content that the client wants The resource and representation of the e-mail entry cannot be edited or modified When the Permutations pattern is applied to an HTML form, the HTML form without any content is the representation of a resource The URL http://mydomaincom/resource/step1 is an example resource that maps to the HTML form http://mydomain.

messages that can be processed using the Message property. This property will contain a list of the message variables defined in the project. Along with specifying the message variables handled by each shape, you must also connect the shape to an appropriate port. Connecting a Send or Receive shape to a Port shape is done by dragging the green connector icon from one shape and dropping it on the other. A green line connecting the shapes then indicates the connection. Figure 7-10 shows a simple example of an orchestration that connects Send and Receive shapes to ports without any processing.

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com/resource/ step1html The end user fills in the form, and a state is created If the end user were to press the Back button and then the Forward button on the web browser, the created state would be lost (to avoid losing the state, most browsers remember the HTML form element contents) The problem is that the resource URL is for an empty HTML form representation To remember the state, another URL (for example, http://mydomaincom/resource/step1/state/1234) needs to be defined Defining a new URL is not a problem, and this topic is covered shortly What needs to be noted is that editable HTML pages have multiple resource URLs that are dependent on the state So the problem in Figure 9-4 is how to associate a state with the resource (the example illustrated uses a URL).

1. In my book Ajax Patterns and Best Practices (Berkeley, CA: Apress, 2006), I present an example where getting the last result will delete the last result. At the time of the book s writing, it seemed like the best solution. From the feedback provided by my readers, and for the stability and robustness purposes, KISS was implemented. Using KISS, the server would generate a complete result set where a client would keep a cursor to the latest result. In the next version of Ajax Patterns and Best Practices, the Infinite Data pattern will be updated. Please note that the approach outlined in the Infinite Data pattern works. The problem is the nature of the XMLHttpRequest client and Web browser being insecure and unreliable (there is no way to validate who is using the Web browser nor what data that person has received).

By default, Receive shapes do not accept messages automatically. If you want a Receive shape to automatically process messages sent from an associated port, you must set the Activate property to True. If you do not have at least one Receive shape in your orchestration with the Activate property set to True, then the orchestration can only be started by another orchestration. This means that your BTS solution as a whole must have at least one Receive shape activated in at least one orchestration. After a Receive shape is set to be active, you can specify a filter to screen out messages sent from the port. This filtering mechanism allows you to determine if an incoming message should be processed. For example, you might be using the same WSS Document Library to handle both new and processed InfoPath forms. In this case, you might have a Status field that indicates whether or not the form has been processed already. Define the filter for a Receive shape by right-clicking the shape and selecting Edit Filter Expression from the context menu. In the Filter Expression dialog, you can build a filter based on the promotions you made in the message schemas.

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