Question

I’m using an XPath like “school/student[4]”. Could the setNodeText function save to harddisk? My changes only seem to be made in memory.

Answer 1

If I understand correctly, you are trying to change a document then write it to disk.

use XML::LibXML qw( );

my $parser = XML::LibXML->new();
my $doc    = $parser->parse_fh(...);
my $root   = $doc->documentElement();

for my $node ($root->findnodes('//school/student[4]')) {
   $node->removeChildNodes();
   $node->appendText("New text");
}

open(my $fh, '>:raw', ...) or die $!;
print($fh $doc->toString());