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Depending on which of the three options you use to access information using your Java classes, this information must at some point be saved back to a file (probably to the one from which it was read). When the user of your application invokes a File->Save action, the information in the application must be written out to an ApplicationML file. Now this information is stored in memory, either as a (DOM) tree of nodes, or in your own proprietary object model. Also note that most DOM XML parsers can generate XML code from DOM document objects (but its quite trivial to turn a tree of nodes into XML by writing the code to do it yourself). There are 2 basic ways to get this information back into an ApplicationML file:

• You can generate the XML yourself (from your object model). If you created an object model that simply imports information from your XML document (using SAX or DOM), you would have to write a class that would convert your object model into an XML file (or set of XML files). This class would have to create an ApplicationML file that contains the information in your Java object model (which is in memory). Since this object model is not an adapter on top of DOM, it is not possible to use the DOM parser to generate the XML for you.
• You can use the DOM parser to generate the XML for you if you created an object model that is an adapter on top of DOM. Since your object model uses the document object tree, all the information contained in it is actually stored in the tree. The XML parser can take this tree and convert it to XML for you, you can then save this generated XML to a file. So the DOM parser can generate the ApplicationML file for you.
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