When creating your own schema documents, it is a good idea to use annotations to provide instructions in a human-readable format. Annotations are just like HTML comments; to add an annotation, you need to add an <annotation> element and a documentation element to enclose the annotation. For example, we could change our root element declaration to read as:
There is much, much more you can do with a schema document; this is just intended as an introduction. Using a schema for such a simple document in the real world would be a bit of a waste--look at how much code is needed. Remember the DTD for the news.xml document from the XML article? If not, it was only about five lines of code long, as opposed to the 20 that you’ve just typed out. Schemas are so useful, however, when dealing with data centric documents using many different types of data, that it is worth taking the time to learn how to use them.
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