I don't know XML::Twig all that well, but the doc says:
XML::Twig::Elt

new ($optional_tag, $optional_atts, @optional_content)

The tag is optional (but then you can't have a content ), the $optional_atts argument is a refreference to a hash of attributes, the content can be just a string or a list of strings and element.

You are providing a list of arrayrefs where it's expecting strings or elements. Maybe do something like: 
push @newElts, XML::Twig::Elt->new( keyword => {translate => 'true'}, 
+$_ ) for @keywords;

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In reply to Re: Inserting new elements in an XML doc using XML::Twig by ysth
in thread Inserting new elements in an XML doc using XML::Twig by GrandFather

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