$ perl -MXML::LibXML -le " print XML::LibXML::Element->new"
Usage: XML::LibXML::Element::new(CLASS, name) at -e line 1.

$ perl -MXML::LibXML -le " print XML::LibXML::Element->new(q{q})"
<q/>

$ perl -MXML::LibXML -le " $q = XML::LibXML::Element->new(q{q});  $q->setData;  print $q;"
Can't locate object method "setData" via package "XML::LibXML::Element" at -e line 1.

$ perl -MXML::LibXML -le " $q = XML::LibXML::Element->new(q{q});  $q->setValue;  print $q;"
Can't locate object method "setValue" via package "XML::LibXML::Element" at -e line 1.

$ perl -MXML::LibXML -le " $q = XML::LibXML::Element->new(q{q});  $q->nodeValue(66);  print $q;"
<q/>

$ perl -MXML::LibXML -le " $q = XML::LibXML::Element->new(q{q});  $q->nodeValue=(66);  print $q;"
Modification of a read-only value attempted at -e line 1.

$ perl -MXML::LibXML -le " $q = XML::LibXML::Element->new(q{q});  $q->replaceValue(55);  print $q;"
Can't locate object method "replaceValue" via package "XML::LibXML::Element" at -e line 1.

$ perl -MXML::LibXML -le " $q = XML::LibXML::Element->new(q{q});  $q->replaceText(55);  print $q;"
Can't locate object method "replaceText" via package "XML::LibXML::Element" at -e line 1.

$ perl -MXML::LibXML -le " $q = XML::LibXML::Element->new(q{q});  $q->appendText(55);  print $q;"
<q>55</q>