NAMESPACES A true (1) or false (0, undef) value; if this parameter is present and its value is true, then the module will accept two-member array reference in the place of element and attribute names, as in the following example: my $rdfns = "http://www.w3.org/1999/02/22-rdf-syntax-ns#"; my $writer = new XML::Writer(NAMESPACES => 1); $writer->startTag([$rdfns, "Description"]); The first member of the array is a namespace URI, and the second part is the local part of a qualified name. The module will automatically generate appropriate namespace declarations and will replace the URI part with a prefix.