My guess is that the plugins support Microdata and RDFa while the hosted
pyRDFa only supports RDFa.
The code example in your other email has attributes "itemscope" and
"itemtype"; these are Microdata attributes.
RDFa defines "typeof" and uses "rel", "rev" and other attributes to
encode RDF in HTML.
RDFa parsers treat stylesheet links in a special way as you have seen,
just like they may include the page title as dc:title. (This is from the
top of my head, everything can be found in the RDFa Primer  and Core
On 13/7/'12 12:26 AM, Karen Coyle wrote:
> In some very quick testing, the browser plugins on the pyRDFa site 
> seem to return better results than the w3c-based web site itself. The
> latter always seems to pull up a mass of stylesheet info (could that
> be intentional?) but the plugin seems to just return the relevant data:
> @prefix ns1: <http://www.facebook.com/2008/> .
> @prefix og1: <http://opengraphprotocol.org/schema/> .
> @prefix v: <http://rdf.data-vocabulary.org/#> .
> og1:description "Buy our Apple MacBook Pro from our wide range of
> Laptops. The Apple MacBook Pro features a 750GB hard drive and comes
> with 8GB of RAM and an HD webcam."@en;
> og1:image "http://image.ebuyer.com/UK/P0387621.jpg"@en;
> og1:site_name "Ebuyer.com"@en;
> og1:title "Apple MacBook Pro Laptop - Laptops | Ebuyer.com"@en;
> og1:type "product"@en;
> ns1:fbmlapp_id "116440215086168"@en .
>  a v:Product;
> v:brand "Apple UK"@en;
> v:category "Apple Laptops"@en;
> v:description """- Intel Core i7 DC 2.9GHz
> - 8GB RAM + 750GB HDD
> - 13.3" LED + Thunderbolt
> - Webcam + Bluetooth
> - Apple OS X LionShow more details…"""@en;
> v:name "Apple MacBook Pro Laptop"@en .
>  a v:Offer;
> v:availability "in_stock"@en;
> v:currency "GBP"@en;
> v:price "1149.47"@en;
> v:quantity "17"@en .
>  http://www.w3.org/2007/08/pyRdfa/ plugins for firefox and opera
> are a ways down the page.