#!perl
use strict;
use HTML::TreeBuilder 5 -weak; 

my $tree = HTML::TreeBuilder->new;  
$tree->parse_file(\*DATA);

my @items = $tree->look_down( '_tag', 'meta' )
   or die("no items: $!\n");
for my $item (@items) {
  print $item->attr('itemprop');
  print ' = ';
  print $item->attr('content')."\n";
}

__DATA__
<div class="review-content">
  <div class="biz-rating biz-rating-very-large clearfix">
    <div itemtype="http://schema.org/Rating" itemscope="" itemprop="reviewRating">
      <div class="rating-very-large">
        <i title="4.0 star rating" class="star-img stars_4">
            <img width="84" height="303" src="http://blah/v2/stars_map.png" class="offscreen" alt="4.0 star rating">
        </i>
        <meta content="4.0" itemprop="ratingValue">
      </div>
    </div>
    <span class="rating-qualifier">
      <meta content="2011-01-13" itemprop="datePublished">
        1/13/2011
    </span>
  </div>
  <p lang="en" itemprop="description" class="review_comment ieSucks">
    blah!!
  </p> 
</div>