Is the tm element the only child of another node? If so, you can get the parent of the matching node, remove it's children, then insert the text node:
use strict;
use warnings;
use XML::LibXML;
my $xml_str = <<_XML_STR;
<foo>
<bar>
<tm tmclass="ibm" tmowner="IBM Corporation"
tmtype="reg" trademark="AIX">AIX</tm>
</bar>
</foo>
_XML_STR
my $parser = XML::LibXML->new();
my $doc = $parser->parse_string( $xml_str );
my $query = "//tm";
foreach my $node ( $doc->findnodes($query) ) {
my $val = $node->findvalue( '@tmowner' );
my $txt = $node->textContent();
if( $val !~ /my_company/ ) {
my $parent = $node->parentNode();
$parent->removeChildNodes();
$parent->appendTextNode( $txt );
}
}
print $doc->toString;
would produce:
<foo>
<bar>AIX</bar>
</foo>
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