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Each if these sequences could be empty. The sequences ,A cat sat. , ,. , ,on the mat. represent a document with the text A cat sat on the mat and the cursor positioned immediately after the word sat. The sequences ,A cat sat. , ,quietly. , ,on the mat. represent a document A cat sat quietly on the mat with the word quietly highlighted at the cursor. The sequences ,. , ,. , ,. represent a blank (new) document. Thus we try to identify the operations that are important, the data that they operate on, and the state space that provides the organization of these operations into a system. In many cases, these operations relate to stories, and the identi cation of the data that they operate on will be an important activity. As we gradually build up the system in increments, we will nd that the data being operated on will gradually expand or become re ned (in a database application the database structure may change), new tables added when new stories need them; in the word processing example, the structure of a document will become more complex (e.g., if we are inserting pictures into the text, this will need an extended vocabulary including le references for the pictures that are inserted in the appropriate place in the text).
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MULTIPLE STORIES AND XXMs
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What if we have a number of connected stories such as in Fig. 5.7 Here is an example: F-net (see 4). Figure 6.9 is a top-level view of the system illustrating how different sections relate to each other. The diagram is not complete as the subsidiary pages have no arrows leaving them the convention here is that they will return to the main page, but nal decisions have not yet been made, and the diagram may be expanded at a later time. Now we are beginning to see how the system might t together; how it might look to the user and behave. It is worth showing the client some mock-ups of the interface at this stage and work through the scenarios derived from the requirements analysis that you have been doing. We can get some feedback to enable us to check if we are going in the right direction. The client can also reexamine his or her ideas and perhaps see new opportunities or problems with their original thoughts.
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6.6 Multiple Stories and XXMs
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Figure 6.9 Main XXM for F-net system.
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The next, more detailed example that we will consider is the DELTAH project (Fig. 6.10) that involved a set of Web pages organized as follows: The user interface contains nine main Web pages called FrontPage, Home, Deltah, About, News, Downloads, Questionnaire, Links, and Contact Us. Each of these Web pages may
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The DELTAH home page.
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Figure 6.11 XXM for Questionnaire section.
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also include one or more subpages as well. The user can open each Web page simply by clicking on its name. The next task is to think about the order in which these screens will be deployed and the tasks that can be done on each screen. The sequence of Web pages are described using the set of XXMs shown in Figs. 6.11 6.15.
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Figure 6.12 XXM for MailingList section.
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6.6 Multiple Stories and XXMs
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From the diagrams, one can see how the basic functions are organized. These machines differ from the standard nite state machine and from the statecharts sometimes used in UML in the sense that there is a memory in the machine, and the transitions involve functions that manipulate the memory as and when an input
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Figure 6.15 XXM for Press section.
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is received. This provides an integrated modeling approach that combines in one diagram both processing and data. This is explained by referring to the requirements table and the story cards where the memory connection is described. For example, in the rst diagram (Fig. 6.11), the memory in this case is likely to be the database that contains the questions in the questionnaires together with the answers, and so on, etc. of customers and orders. The function ClickLogin simply navigates between two screens and has no memory implications, but the function ClickEdit will involve some interaction with the database; it will download questions to be edited generating a message if none are on the database. There may be some dialogue with the user to identify the precise questions that need editing. This would be described in a subsidiary diagram, using the hierarchical properties of XXMs. The function ClickSave in Fig. 6.16 actually changes the database by updating the records with the new or altered questions. The memory structure now needs to be discussed. Essentially, we need to think about this in terms of what basic types of memory structure are relevant at the different levels. At the top level, for example, we could represent it as a small vector or array of compound types of the form: Questionaires : set of questions where questions : question number; question text; question answer and the data is text.
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