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+This module implements an XML diff producing XML output. Both input and
+output are DOM documents, as implemented by XML::LibXML.
+
+The diff format used by XML::DifferenceMarkup is meant to be
+human-readable (i.e. simple, as opposed to short) - basically the diff
+is a subset of the input trees, annotated with instruction element nodes
+specifying how to convert the source tree to the target by inserting and
+deleting nodes. To prevent name colisions with input trees, all added
+elements are in a namespace http://www.locus.cz/XML/DifferenceMarkup
+(the diff will fail on input trees which already use that namespace).
+
+WWW: http://search.cpan.org/dist/XML-DifferenceMarkup/
+
+-- Sergey Skvortsov
+skv@FreeBSD.org