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The applications that you create with Java and XML will rely on the services provided by your Java XML Parser (using DOM or SAX). The information itself might be stored in a variety of persistence engines (object databases, relational databases, file systems, dynamic websites, etc.). The information however that comes out of these persistence storage engines must be converted to XML (if they are not in XML already). Once this is done, you have to be concerned with the material covered in this document. This document outlines the most popular Java XML application categories that are possible in an environment where data is encoded with XML, where web access is ubiquitous and platform independence is a necessity.

Java Application Layer

All of the code that you write (in your Java classes) might be considered the Java application layer. Other layers are the XML Parser layer, the XML source (that supplies the XML data that is necessary), and the persistence engine (where the data is actually stored and retrieved by the source).

Your code (in the Java application layer) has to make use of the DOM or SAX API and the XML parser in order to access the information in XML documents (that come from your source). The source might be responsible for pulling data from different persistence engines (relational or object databases) and even the web (dynamically generated websites that supply only XML data).

EM and I elements to use an italic font -- again, as usual.

Figure 5-25

Figure 5-25. Ordinary document behavior through CSS

On the other hand, you might decide that there should be a subtle difference between EM and I:

P {font-style: normal;}
EM {font-style: oblique;}
I {font-style: italic;}