If you are only after the text values of certain tags you could do something like this:

sub parsing {
    my ( $twig, $account ) = @_;
    my @tags = qw(
        Id
        OwnerFirstName
        OwnerLastName
    );
    my %hash = map { $_ => $account->findvalue($_) } @tags;
    validate( \%hash );
}

sub validate {
    my ( $hash ) = @_;
    if ( $hash->{'Id'} eq 'abcd' ) {
        print "Id $hash->{'Id'} is valid\n";
    }
    else {
        print "Id $hash->{'Id'} is not valid\n";
    }
}
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If you need to get attributes as well, like the values in 'CreationDate' then you will have to do a bit more work:

my @cdates = $account->findnodes('CreationDate');
my $cdate = $cdates[0];
$hash{'date'} = join('-', $cdate->att('day-of-month'), $cdate->att('mo
+nth'), $cdate->att('year') );
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