in reply to Trouble using XML::XPath::XMLParser::as_string ?

Is there some subtle point to XML::XPath::XMLParser::as_string I am missing?

There isn't anything subtle about it, call methods as methods

XML::XPath 

$doc->findnodes_as_string('//...');

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XML::XPath::Node::Element 
$node->string_value
$node->toString

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In Section Seekers of Perl Wisdom