[phpXML] Large amounts of data

[<spr...@ho...>]

I'm using phpXML to export/import object heirarchies in an application 
server. I haven't run into the memory limit yet, but when the application 
server starts getting some real use people may want to back up an entire 
site.

I'm thinking of creating an extension of phpXML that stores node content in 
a temporary file instead of keeping it in memory. The method 
set_external_content() will write to a file pointer and then set some node 
attributes like ext_ctnt_position and ext_ctnt_length. The method 
get_external_content() will use those attributes to seek to that position in 
the file and grab the specified content.

Any thoughts on this? Pitfalls? Interest?
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