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rdfa parsing issue -- was: fixed https://foafssl.org/test/WebId

From: Henry Story <henry.story@bblfish.net>
Date: Fri, 6 Jan 2012 13:49:46 +0100
Cc: "public-xg-webid@w3.org XG" <public-xg-webid@w3.org>
Message-Id: <46CB70C0-2363-428A-8F18-0179599D0A38@bblfish.net>
To: Jürgen Jakobitsch <j.jakobitsch@semantic-web.at>, Damian Steer <pldms@mac.com>

On 6 Jan 2012, at 02:10, Henry Story wrote:

> 
> On 6 Jan 2012, at 01:53, Henry Story wrote:
>>> 
>>> note : still i get "keys don't match"
>> 
>> Mhh. Well perhaps another error now, or perhaps I just did not fix the error correctly.
>> Perhaps if you send me your public/private key, then I can continue debugging it from here without going over the list.
> 
> I am starting to think it is my rdfa parser that has a problem. So I'll look into that in more detail first thing tomorrow.

Yes, the problem comes from an issue with parsing your content. I am using Damian Steers rdfa parser, which he himself claims is quick and dirty https://github.com/shellac/java-rdfa

Shellac's parser parses the xhtml correctly as xhtml in fact, but when the html parser is used it comes to a different conclusion. This is I suppose the huge problem of dealing with metadata in dirty old html. Now you may ask: why am I parsing it as html when it is quite clearly xhtml? Well that is because you are serving your content as html. 

--------------8<----------------------------------
$ curl -I  http://2sea.org/sea.jsp 
HTTP/1.1 200 OK
Server: Apache-Coyote/1.1
Set-Cookie: JSESSIONID=737470C327A5268D1F28F146049BE510; Path=/
Content-Type: text/html;charset=UTF-8
Content-Length: 1996
Date: Fri, 06 Jan 2012 12:44:05 GMT
------------------------------------------------

Here the output in xhtml seems to be correct

--------------8<----------------------------------
$ rdfa.sh --format XHTML http://2sea.org/sea.jsp 
     @prefix : <http://www.w3.org/ns/auth/cert#> .
    @prefix sea: <http://2sea.org/sea.jsp#> .
    
    <http://2sea.org/sea.jsp>     a <http://xmlns.com/foaf/0.1/PersonalProfileDocument>;
         <http://xmlns.com/foaf/0.1/maker> sea:j .
    
    sea:j     a <http://xmlns.com/foaf/0.1/Person>;
         :key  [
             a :RSAPublicKey;
             :exponent 65537;
             :modulus "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"^^<http://www.w3.org/2001/XMLSchema#hexBinary> ];
         <http://xmlns.com/foaf/0.1/depiction> <http://2sea.org/2sealogo.png>;
         <http://xmlns.com/foaf/0.1/name> "jürgen" .    
------------------------------------------------


But as you can see with html the key is said to belong to the page, not to the user anymore


--------------8<----------------------------------
$ rdfa.sh --format HTML http://2sea.org/sea.jsp 

     @prefix : <http://www.w3.org/ns/auth/cert#> .
    @prefix sea: <http://2sea.org/sea.jsp#> .
    
    <http://2sea.org/2sealogo.png>     :key  [
             a :RSAPublicKey;
             :exponent 65537;
             :modulus "986534d06d133821f40157c15891857d537d20af028656ddca1caf93cd3cc9104d4f172cf14d6102ddf13b16852c09b3fccb0a2fe2a2e895b8f5993fd87321d1a03b656cac78726715f7198f7c5d539b8197fd35bafe274ceade6694ec38c86609a25d6988f6e749f401c37145ac11142d84d775f4f929dbcd6ba809ab4e39b3dc36087062efcf73050e313f60929b7f969b8b6bc80e25ef6000bbe66d6925aba09aed8a16271d6d9651edb27c6bb50a1ffc6bc7d8bfe8346965cf0b5993385352157fb7df1b143a97ac7d642428c1f87dd7988364115dcfa05cfb020b595417feb54febaa8ac4a81c40ba9ac1dc6a097f53b379ba9850e0a45e2f1c452f3743"^^<http://www.w3.org/2001/XMLSchema#hexBinary> ] .
    
    <http://2sea.org/sea.jsp>     a <http://xmlns.com/foaf/0.1/PersonalProfileDocument>;
         <http://xmlns.com/foaf/0.1/maker> sea:j .
    
    sea:j     a <http://xmlns.com/foaf/0.1/Person>;
         <http://xmlns.com/foaf/0.1/depiction> <http://2sea.org/2sealogo.png>;
         <http://xmlns.com/foaf/0.1/name> "jürgen" .
------------------------------------------------

RDFA 1 is defined in xhtml only I understand, so it is true that we are going beyond what the spec by trying to parse html too. Perhaps this will be a lot simplified with rdfa1.1 which can be made to work with html5.

Perhaps this is a simple parsing bug that can be fixed by Damian, perhaps not....


Henry
Received on Friday, 6 January 2012 12:50:21 GMT

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