[Clipart] FYI: SVG::Metadata -> to_rdf() doesn't escape metadata content

[Matteo Ianeselli]

Just to warn that, looking at the source of SVG::Metadata 0.18, it seems
that to_rdf() just puts in metadata values without escaping back '<',
'>' and '&' as entities (< > &).

This invariably results in an invalid XML file when metadata values
contain the above characters (just noticed that in submitting
'crt_monitor_01.svg' to openclipart.org last evening).
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