XML to java object AND Performance

Hi,
I read some article about marshalling a XML file to Java Object (like Castor, XML Beans projects...)
To resume: I would like to marshal a XML doc (from XML to Java object. Later I would like to put these objects on a SGBD...). Unfortenaly I suppose that approach is to expensive on term of performance? Supposing that my xml doc contain 100 data's occurances, XML bean woulkd create 100 objects corresponding. My problem is that I don't want that the all 100 objects live in the same time on memory. For example, my code will read sequential, the xml occurances (like a Sax parser), create 10 datas objects (standby), put these in the data base, and destroy these objects before...iteratively create the next 10 objects...
It is possible ? Can anybody help me?
Thank

On the article: Java Architecture for XML Binding (JAXB)
(http://java.sun.com/developer/technicalArticles/WebServices/jaxb/)
I found maybe a response?
"...in other words, you can do a SAX parse of a document and then pass the events to JAXB for unmarshalling. "
But somebody could help me to write the code to do that?

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    Thank you for reading this email...
    If I have a **DTD** like:
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    2) "Tree" (e.g. DOM in JAXP, or it's better cousin JDOM): You call a parser that in one swoop creates an entire hierarchy that corresponds to the XML document. You don't get called on each tag as with SAX, you just get the root of the resulting tree. Drawback: All the nodes in the tree have the same type! You probably want to know which tags are in the document, don't you? Well, you'll have to traverse the tree and ask each node: What tag do you represent? And what are your attributes? (You get only strings in response even though your attributes often represent numbers.) Unless you want to display the tree - that's a nice application, you can do it as a tree model for JTree -, or otherwise don't care about the individual tags, DOM is not of much help, because you have to keep track where in the tree you are while you traverse it.
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