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to process it and pass it on to the next component in the pipeline.
If something catastrophic happens, and the record is lost, then an
out-of-band mechanism may be used to request a new copy of the record
from the writer.  The C<Alvis::Pipeline> module does not directly
support such requests; they are considered to be application-level and
therefore not appropriate for this low-level module to deal with.

(As a matter of application design, we offer the observation that, in
Alvis, the C<<id>> attribute on the top-level element specifies the
identity of the record, and should remain changed even if the record
itself is updated; so any out-of-band request for records to be
re-sent should do so by specifying the IDs of the required records.)

=head2 write()

 # Write-pipes only
 $out->write($xmlDocument);

Writes an XML document to the specified outbound pipe.  The document
may be passed in either as a DOM tree (C<XML::LibXML::Element>) or a
string containing the text of the document.  Throws an exception if an