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Visual Modeling

Earlier in this chapter, you learned that one of the basic DTD design process steps is to construct the hierarchy, to use the content models in the DTD to arrange the elements in an XML document that uses the DTD in a hierarchical, tree-like structure. Many information modeling techniques are available, but detailed discussion of them falls outside the scope of this book. What is of interest to us here is that all recommend some kind of visual aid to help you. The same applies for DTD development, but each expert has his or her own set of symbols. Some prefer to model using the blocks familiar from flow diagrams, as shown in Figure 14.5.

Figure 14.5. Block diagram DTD modeling.



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