It depends... Do you mean simple in the sense of performance? Well, who says that your existing XML file has to be treated as such (parsed and validated)? Seek to the end of the file, before the </a>, add another <b>...</b></a> sequence and done. But I guess, you want a little bit more than that...and a little bit more robustness?
The previous suggestion is simple to program, but surely not the fastest way to append a node to a (potentially large) file.

In reply to Re^3: Perl Hash to XML by Perlbotics
in thread Perl Hash to XML by Bugz

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