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use warnings;
use strict;
...
foreach my $attribute( $dom->findnodes('/test/result_summary/@*') ) {
    print $attribute->nodeName, " = ", $attribute->to_literal, "\n";
}

******* get individual attribute by name: ***********
...
download_key = xmxnxnxnxnxnxnxnxnx
time_start = 2020-02-19 15:50:55
feed_version = 1.44