Using XML for audit trail

I want to use XML for an audit trail.  The problem I am having is that I
would like to only use append operations to write to the file.

My thought had been to write an element to each line, with sub-elements and
the end on the same line.  I could then parse each line when reading the
file.  The problem is I can't figure out how to get the XML for a
node/element/document, and all of the sub-elements, to write out as a single
line.

Alternatively  I could use some other mechanism to parse the file and read
each audit entry (xml element with sub-elements) in sequence.

Any suggestions on how to either write the XML as a single line or a
preferred method for parsing elements in a file one at a time?

Thanks,
-Mont

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