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no need to call this function unless you have a long-running operation
and want to partially output the page. Please note, however, that, as
headers have to be output on the first call, no headers (this includes the
content-type and character set) can be changed after this call. Also, you
must not change any state variables or any related info after this call,
as the result might not get saved in the database, so you better commit
everything before flushing and then just continue output (use GET or POST
to create new links after this).

Flushing does not yet harmonize with output stylesheet processing, for the
semi-obvious reason that PApp::XSLT does not support streaming operation.

BUGS: No links that have been output so far can be followed until the
document is finished, because the neccessary information will not reach
the disk until the document.... is finished ;)

=cut

sub _unicode_to_entity {
   sprintf "&#x%x;", $_[0];
}