Thanks very much for your help. After some tweaking it seems to work. I've ended up with this code:

sub XML::LibXML::Element::STORABLE_freeze {
    shift->toString
}

sub XML::LibXML::Element::STORABLE_attach {
    'XML::LibXML'->load_xml(string => pop)->documentElement
}

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In reply to Re^4: Use Storable for storing XML::LibXML object by buff
in thread Use Storable for storing XML::LibXML object by buff

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