[XML-SIG] XML processing

[Bill Kinnersley]

John W. Shipman wrote:
> 
> This document does not discuss the lxml package's toolset for the
> equivalent of SAX (when the document doesn't fit in memory);

Can anyone add any substance to this remark?  With today's typical 
system RAM of 2GB to 3GB, is it even worth consideration any more that a 
document might not fit in memory?

Offhand I'd guess the size of the XML file and the size of the DOM tree 
would be in the same ballpark.  So unless I've got more than 500MB of 
XML to read, I'm clear.  Right or wrong?