font-family property, but you really shouldn't have to do that. Besides, it's no fun having to write a style sheet such as this:

H1 {font-family: 'Zurich UltraBlack', sans-serif;}
H2 {font-family: 'Zurich Black', sans-serif;}
H3 {font-family: 'Zurich Bold', sans-serif;}
H4, P {font-family: Zurich, sans-serif;}
SMALL {font-family: 'Zurich Light', sans-serif;}

Besides the obvious tedium of writing such a style sheet, it only

Saturday 22nd of November 2008 08:13:19 AM

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By not predefining any tags in the XML Recommendation, the W3C allowed developers full control over customizing their data as they see fit. This makes XML very attractive to encoding data that already exists in legacy databases (by using database metadata, and other schema information). This extensibility of XML makes it such a great fit when trying to get different systems to work with each other.

XML supports shareable structure (using DTDs)

Since the structure of the XML document can be specified in DTDs they provide a simple way to make it easier to exchange XML documents that conform to a DTD. For example, if two software systems need to exchange information, then if both of the systems conform to one DTD, the two systems can process information from each other. DTDs are not as powerful as some kind of schema architecture for XML, they don't support typing, subclassing, or instantiation mechanisms that a schema architecture must have.

DTDs are a simple way to make sure that 2 or more XML documents are of the same "type". Its a very limited approach to making "typed" XML documents shareable across systems. In the future some kind of schema system will be proposed by the W3C that should allow typing, instantiation and inheritance of information (in XML).

In your application layer, you can create many interesting Java applications. The apps can run on the server side or client side or both. They may have graphical user interfaces or they may be web based. When I use the word application or app in this chapter, I don't exclude Java applets; I mean application (or app) in the broad sense of the word, i.e., I mean it to describe a software system written in Java that solves a real-world problem.

3 Main categories

There are many different types of software that you can write in Java to make use of XML. I have created 3 major categories to describe certain types of apps (that are currently popular) that are really well suited to the use of XML. This is by no means a comprehensive set of categories; you can create your own, and many more major categories will emerge as XML becomes more popular.

Client side - Graphical Java Applications