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<?xml version="1.0" encoding="UTF-8"?>
<epp xmlns="urn:ietf:params:xml:ns:epp-1.0" xmlns:xsi="http://www.w3.o
+rg/2001/XMLSchema-instance" xsi:schemaLocation="urn:ietf:params:xml:n
+s:epp-1.0 epp-1.0.xsd">
...
        <contact:id>testaccount3</contact:id>
        <contact:add/>
        <contact:rem/>

for my $remove ($frame->findnodes(q{/command/update/contact:update/con
+tact:add})) {
    $remove->unbindNode;
}

XPath error : Undefined namespace prefix
 error : xmlXPathCompiledEval: evaluation failed

sub new {
    my $package = shift;
...

    return $self;
}

my $p = $frame->getElementsByTagName('contact:update');
    foreach my $n ($p->[0]->childNodes()) {
        $p->[0]->removeChild($n) if $n->toString(1) eq "<contact:add/>
+";
    }