Performance optimization and avoiding Out of Memory er

I'm working with quite important XML Data Base ( 10 Mo) and trying to
extract information and transform it into HTML files and rtf format.
I work with Xt processor (release 19990511)
I have two big problems :
1)time of genration is very important 
I create a predocument xml of 10 Mo (with 10 chained requests about 6,000
objects)
This step takes 3 hours, with a station of 512 RAM Memory
Then I create in HTML a file for each object; it takes me 14 hours. 
it is a recursive call :
<dog level="0" name="Toto1">
	<dog level="1" name="Toto1">
		<dog level="2" name="Toto1"
			<dog level="3" name="Toto1">
				<cat>ieodfli</cat>
				<cat>ieodfli</cat>
			</dog>
		</dog>
		<dog level="2" name="Mydog">
			<dog level="3" name="Toto1">
				<cat>ieodfli</cat>
				<cat>ieodfli</cat>
			</dog>
		</dog>
	</dog>
</dog>
I've a template for "dog", with recursive calls, and if I'm in level "2" I
create a separate HTML page. I've 6000 elements at level 2 and it takes me
10 hours. How can I optimize this time ?

2) When I work in rtf, I can have out of memory errors, because I write less
files but they become huge (9 Mo octets).
All the output file is kept in memory in memory until the stylesheet is
performed.
How can I introduce an option to force my program to write "in real time" in
the output file ?

I launch xt with Java, with the fonction Driver.main(myArguments), where
myArguments represent source stylesheet output param1=...


Thanks for every help.

Romain Lewden

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