Merge remote branch 'scor/master'
authorHenry J. Story <henry.story@bblfish.net>
Wed, 04 Aug 2010 18:50:19 +0200
changeset 72 5cf4fa7ce7c9
parent 65 386d6bbf19c5 (current diff)
parent 71 903b74261af8 (diff)
child 73 dd0df3dc12ed
Merge remote branch 'scor/master'

Conflicts:
index-respec.html
index-respec.html
index.html
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/.htaccess	Wed Aug 04 18:50:19 2010 +0200
@@ -0,0 +1,1 @@
+DirectoryIndex drafts/ED-webid-20100725/index.html
--- a/index-respec.html	Tue Aug 03 14:41:58 2010 +0200
+++ b/index-respec.html	Wed Aug 04 18:50:19 2010 +0200
@@ -312,7 +312,7 @@
 <p>Developers that are interested in implementing this specification will be
 most interested in the sections titled 
 <a href="#authentication-sequence">Authentication Sequence</a> and 
-<a href="#authentication-sequence-details">Authentication Sequence Details</a></p>.
+<a href="#authentication-sequence-details">Authentication Sequence Details</a>.</p>
   
 </section>
 </section>
@@ -457,60 +457,70 @@
 </section>
 
 <section class='normative'>
-<h3><span class="secno">2.2 </span>Authentication Sequence</h3>
+<h1>Authentication Sequence</h1>
 
-<p>The following steps are executed by Verification Agents and Identification
-Agents to determine the global identity of the requesting agent. Once this is known, the identity can be used to determine if access should be granted to the requested resource.
+<p>The following steps are executed by <tref>Verification Agent</tref>s and
+<tref>Identification Agent</tref>s to determine the global identity of the
+requesting agent. Once this is known, the identity can be used to determine
+if access should be granted to the requested resource.
 </p>
 
 <ol>
-<li>The <a class="tref internalDFN" title="Identification_Agent" href="#dfn-identification_agent">Identification Agent</a> attempts to access a resource
-using HTTP over TLS [<a class="bibref" rel="biblioentry" href="#bib-HTTP-TLS">HTTP-TLS</a>] via the <a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a>.</li>
+<li>The <tref>Identification Agent</tref> attempts to access a resource
+using HTTP over TLS [[!HTTP-TLS]] via the <tref>Verification Agent</tref>.</li>
 
-<li>The <a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a> <em class="rfc2119" title="must">must</em> request the 
-<a class="tref internalDFN" title="Identification_Certificate" href="#dfn-identification_certificate">Identification Certificate</a> of the <a class="tref internalDFN" title="Identification_Agent" href="#dfn-identification_agent">Identification Agent</a>
-as a part of the TLS client-cerificate retrieval protocol.</li>
+<li>The <tref>Verification Agent</tref> MUST request the 
+<tref>Identification Certificate</tref> of the <tref>Identification Agent</tref>
+as a part of the TLS client-certificate retrieval protocol.</li>
 
-<li>The <a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a> <em class="rfc2119" title="must">must</em> extract the <a class="tref internalDFN" title="public_key" href="#dfn-public_key">public key</a> and the
-<a class="tref internalDFN" title="WebID_URL" href="#dfn-webid_url">WebID URL</a> contained in the <code>Subject Alternative Name</code> 
-extension of the <a class="tref internalDFN" title="Identification_Certificate" href="#dfn-identification_certificate">Identification Certificate</a>. <p class="issue">There may be more than one URI in the SAN</p> </li>
+<li>The <tref>Verification Agent</tref> MUST extract the <tref>public key</tref> and the
+<tref>WebID URI</tref> contained in the <code>Subject Alternative Name</code>
+extension of the <tref>Identification Certificate</tref>.
+<p class="issue">There may be more than one URI in the SAN</p></li>
+
 <li>
-The <a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a> verifies that the 
-<a class="tref internalDFN" title="Identification_Agent" href="#dfn-identification_agent">Identification Agent</a> owns the private key corresponding to the public key  sent in the <a class="tref internalDFN" title="Identification_Certificate" href="#dfn-identification_certificate">Identification Certificate</a>. This <em class="rfc2119" title="should">should</em> be fulfilled by performing TLS mutual-authentication
-between the <a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a> and the 
-<a class="tref internalDFN" title="Identification_Agent" href="#dfn-identification_agent">Identification Agent</a>. 
-If the <a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a> does not have access to the TLS layer, 
-a digital signature challenge <em class="rfc2119" title="may">may</em> be provided by the 
-<a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a>. These processes are detailed in the section
+The <tref>Verification Agent</tref> verifies that the 
+<tref>Identification Agent</tref> owns the private key corresponding to the public key  sent in the 
+<tref>Identification Certificate</tref>. This SHOULD be fulfilled by performing TLS mutual-authentication
+between the <tref>Verification Agent</tref> and the 
+<tref>Identification Agent</tref>. 
+If the <tref>Verification Agent</tref> does not have access to the TLS layer, 
+a digital signature challenge MAY be provided by the 
+<tref>Verification Agent</tref>. These processes are detailed in the section
 on  
-<a href="#secure-communication">Secure Communication</a>.<p class="issue">We don't have any implementations for this second way of doing things, so this is still hypothetical. Implementations using TLS mutual-authentication are many</p> </li>
+<a href="#secure-communication">Secure Communication</a>.
+<p class="issue">We don't have any implementations for this second way of doing 
+things, so this is still hypothetical. Implementations using TLS mutual-authentication are many</p>
+</li>
+
 <li>The meaning of the 
-<a class="tref internalDFN" title="WebID_URL" href="#dfn-webid_url">WebID URL</a> is a graph of relations that is fetched by the <a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a> 
-by either by dereferencing the <a class="tref internalDFN" title="WebID_URL" href="#dfn-webid_url">WebID URL</a> and 
+<tref>WebID URI</tref> is a graph of relations that is fetched by the <tref>Verification Agent</tref> 
+either by dereferencing the <tref>WebID URI</tref> and 
 extracting RDF data from the resulting document, or by utilizing a cached 
 version of the RDF data contained in the document or other data source that is 
-up-to-date and trusted by the <a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a>. The processing
+up-to-date and trusted by the <tref>Verification Agent</tref>. The processing
  mechanism is further detailed in the sections titled 
 <a href="#processing-the-webid-profile">Processing the WebID Profile</a>
 </li>
 
-<li>If the <a class="tref internalDFN" title="public_key" href="#dfn-public_key">public key</a> in the 
-<a class="tref internalDFN" title="Identification_Certificate" href="#dfn-identification_certificate">Identification Certificate</a> matches one in the set given by the profile document graph given above then the 
-<a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a> knows that the <a class="tref internalDFN" title="Identification_Agent" href="#dfn-identification_agent">Identification Agent</a> is indeed identified by the <a class="tref internalDFN" title="WebID_URL" href="#dfn-webid_url">WebID URL</a>. The verification is done by querying the 
-Personal Profile graph as specified in <a href="#extracting-webid-url-details">querying the RDF graph</a></li>
-
+<li>If the <tref>public key</tref> in the 
+<tref>Identification Certificate</tref> matches one in the set given by the
+profile document graph given above then the <tref>Verification Agent</tref>
+knows that the <tref>Identification Agent</tref> is indeed identified by the
+<tref>WebID URI</tref>. The verification is done by querying the 
+Personal Profile graph as specified in <a href="#extracting-webid-uri-details">querying the RDF graph</a>.</li>
 </ol>
 
 <p>
-The <a class="tref internalDFN" title="Identification_Agent" href="#dfn-identification_agent">Identification Agent</a> <em class="rfc2119" title="may">may</em> re-establish a different identity at 
+The <tref>Identification Agent</tref> MAY re-establish a different identity at 
 any time by executing all of the steps in the Authentication Sequence again. 
-Additional algorithms, detailed in the next section, <em class="rfc2119" title="may">may</em> be performed to 
-determine if the <a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a> can access a particular 
+Additional algorithms, detailed in the next section, MAY be performed to 
+determine if the <tref>Verification Agent</tref> can access a particular 
 resource after the last step of the Authentication Sequence has been
 completed.
 </p>
 
-</div>
+</section>
 
 <section class='normative'>
 <h1>Authentication Sequence Details</h1>
@@ -539,7 +549,7 @@
 <p>A <tref>Verification Agent</tref> MUST be able to process documents in RDF/XML 
 [[!RDF-SYNTAX-GRAMMAR]] and XHTML+RDFa [[!XHTML-RDFA]]. A server responding to 
 a <tref>WebID Profile</tref> request SHOULD be able to deliver at least RDF/XML
-or RDFa. The Verification Agent MUST set the Accept-Header to request
+or RDFa. The <tref>Verification Agent</tref> MUST set the Accept-Header to request
 <code>application/rdf+xml</code> with a higher priority than <code>text/html</code>
 and <code>application/xhtml+xml</code>. If the server answers such a request
 with an HTML representation of the resource, this SHOULD describe the WebId Profile
@@ -570,9 +580,14 @@
       rsa:public_exponent [ cert:decimal ?exp ] .
 }
 </pre>
-<p class="issue">The above query is using the original non literal method of writing a query, and does not support the literal notation. Should we in this document take that to now be deprecated?</p>
-<p class="issue">The above query will work properly if the graph does inferencing on the rsa ontology. If it does not then it would be wise to remove the "a rsa:RSAPublicKey relation from the pattern.</p>
-<p>Currently as a trnsition phase allowing for literals and non literal notationthe following query is adopted:</p>
+<p class="issue">The above query is using the original non literal method of
+writing a query, and does not support the literal notation. Should we in this
+document take that to now be deprecated?</p>
+<p class="issue">The above query will work properly if the graph does
+inferencing on the rsa ontology. If it does not then it would be wise to remove
+the "a rsa:RSAPublicKey relation from the pattern.</p>
+<p>Currently as a transition phase allowing for literals and non literal
+notation the following query is adopted:</p>
 <pre class='example'>
 PREFIX cert: &lt;http://www.w3.org/ns/auth/cert#&gt;
 PREFIX rsa: &lt;http://www.w3.org/ns/auth/rsa#&gt;
@@ -585,9 +600,13 @@
    OPTIONAL { ?e cert:decimal ?exp . }
 </pre>
 <p>In the above query the verifier has to iterate through the answer set,
-converting bindings for ?m and ?e if they are literals to integers, else to check for ?mod and ?exp and convert those to literals. In order to allow for the possibility of there being multiple ways of writing the literals, this process should be able to convert the various integer xsd formats xsd:int, xsd:nonNegativeInteger, xsd:int, ...  [TODO: check that carefully]
+converting bindings for ?m and ?e if they are literals to integers, else to
+check for ?mod and ?exp and convert those to literals. In order to allow for
+the possibility of there being multiple ways of writing the literals, this 
+process should be able to convert the various 
 </p>
-<p>If we move to dropping the deprecated relations - and thereby make writing the rdf easier, the query can be the much simpler</p>
+<p>If we move to dropping the deprecated relations - and thereby make writing
+the rdf easier, the query can be the much simpler</p>
 <pre class='example'>
 PREFIX cert: &lt;http://www.w3.org/ns/auth/cert#&gt;
 PREFIX rsa: &lt;http://www.w3.org/ns/auth/rsa#&gt;
@@ -598,7 +617,8 @@
         rsa:public_exponent ?e .
 }
 </pre>
-<p>Here the verification agent must check that one of the answers for ?m and ?e matches the public key in the certificate</p>
+<p>Here the verification agent must check that one of the answers for ?m and ?e
+matches the public key in the certificate</p>
 <p>If the triple store supports literal inferencing then the query for
 a given modulus "9D79BFE2498..." and exponent "65537" 
 be as simple simple as:
@@ -614,7 +634,8 @@
 </pre>
 <p>If the above query returns True, then authentication has succeeded, otherwise not. </p>
 <p>Note that this will requre the type inferencing engine to be able to
-convert literals written in the profile document as "9D ☮ 79 ☮ BF ☮ E2 ☮ F4 ☮ 98 ☮" into the integer.
+convert literals written in the profile document as
+"9D ☮ 79 ☮ BF ☮ E2 ☮ F4 ☮ 98 ☮" into the integer.
 </p>
 
 <p class="issue">This section still needs more information.</p>
--- a/index.html	Tue Aug 03 14:41:58 2010 +0200
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,635 +0,0 @@
-<?xml version='1.0' encoding='UTF-8'?>
-<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML+RDFa 1.0//EN' 'http://www.w3.org/MarkUp/DTD/xhtml-rdfa-1.dtd'>
-<html dir="ltr" about="" property="dcterms:language" content="en" xmlns="http://www.w3.org/1999/xhtml" xmlns:dcterms='http://purl.org/dc/terms/' xmlns:bibo='http://purl.org/ontology/bibo/' xmlns:foaf='http://xmlns.com/foaf/0.1/' xmlns:xsd='http://www.w3.org/2001/XMLSchema#'>
-<head>
-    <title>WebID 1.0</title>
-    <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
-    
-<!--  
-      === NOTA BENE ===
-      For the three scripts below, if your spec resides on dev.w3 you can check them
-      out in the same tree and use relative links so that they'll work offline,
-      -->
-
-<style type="text/css">
-code           { font-family: monospace; }
-
-span.hilite { color: red; /* font-weight: bold */ }
-
-li p           { margin-top: 0.3em;
-                 margin-bottom: 0.3em; }
-
-div.explanation { background-color: #ADD8E6;
-                   width: 80%;
-                   margin: 12px; padding: 8px; }
-div.explanation li { margin-top: 8px; }
-div.explanation dd { margin: 4px; }
-
-.adef { 
-	font-family: monospace; 
-	font-weight: bold; 
-    color: #ff4500 !important;
-}
-
-.aref { 
-	font-family: monospace; 
-	font-weight: bold; 
-    color: #ff4500 !important;
-}
-
-span.entity { color: red; }
-
-span.element { color: green; }
-</style>
-
-     
-
-<!--     <script src='/ReSpec.js/js/respec.js' class='remove'></script>  -->
-
-    
-  <link href="http://dev.w3.org/2009/dap/ReSpec.js/css/respec.css" rel="stylesheet" type="text/css" charset="utf-8" /><link href="http://www.w3.org/StyleSheets/TR/w3c-unofficial" rel="stylesheet" type="text/css" charset="utf-8" /></head><body style="display: inherit; "><div class="head"><p></p><h1 rel="dcterms:title" class="title" id="title">WebID 1.0</h1><h2 rel="bibo:subtitle" id="subtitle">Web Identification and Discovery</h2><h2 property="dcterms:issued" datatype="xsd:dateTime" content="2010-07-25T22:59:59+0000" id="unofficial-draft-25-july-2010">Unofficial Draft 25 July 2010</h2><dl><dt>Editor:</dt><dd rel="bibo:editor"><span typeof="foaf:Person"><span property="foaf:name">Manu Sporny</span>, <a rel="foaf:workplaceHomepage" href="http://blog.digitalbazaar.com/">Digital Bazaar, Inc.</a> <a rel="foaf:mbox" href="mailto:[email protected]">[email protected]</a> </span>
-</dd>
-<dt>Authors:</dt><dd><span><a content="Toby Inkster" href="http://tobyinkster.co.uk/">Toby Inkster</a></span>
-</dd>
-<dd><span><a content="Henry Story" href="http://bblfish.net/">Henry Story</a></span>
-</dd>
-<dd><span><a content="Bruno Harbulot" href="http://blog.distributedmatter.net/">Bruno Harbulot</a></span>
-</dd>
-<dd><span><a content="Reto Bachmann-Gmür" href="http://www.facebook.com/farewellutopia">Reto Bachmann-Gmür</a></span>
-</dd>
-</dl><p>This document is also available in this non-normative format: <a href="diff-20100711.html">Diff from previous Editors Draft</a>.</p><p class="copyright">This document is licensed under a <a class="subfoot" href="http://creativecommons.org/licenses/by/3.0/" rel="license">Creative Commons Attribution 3.0 License</a>.</p><hr></hr></div>
-    <div id="abstract" class="introductory section" property="dcterms:abstract" datatype="" typeof="bibo:Chapter" about="#abstract"><h2>Abstract</h2>
-
-<p>Social networking, identity and privacy have been at the center of how we 
-interact with the Web in the last decade. The explosion of social networking 
-sites has brought the world closer together as well as created new points of
-pain regarding ease of use and the Web. Remembering login details, passwords,
-and sharing private information across the many websites and social groups
-that we are a part of has become more difficult and complicated than necessary. 
-The Social Web is designed to ensure that control of identity and privacy 
-settings is always simple and under one's control. WebID is a key enabler of the 
-Social Web. This specification outlines a simple universal identification 
-mechanism that is distributed, openly extensible, improves privacy, security 
-and control over how one can identify themselves and control access to their 
-information on the Web.
-</p>
-  
-<div typeof="bibo:Chapter" about="#how-to-read-this-document" class="section">
-<h3 id="how-to-read-this-document">How to Read this Document</h3>
-  
-<p>There are a number of concepts that are covered in this document that the
-reader may want to be aware of before continuing. General knowledge of
-<a href="http://en.wikipedia.org/wiki/Public_key_cryptography">public key cryptography</a> 
-and RDF [<a class="bibref" rel="biblioentry" href="#bib-RDF-PRIMER">RDF-PRIMER</a>] and RDFa [<a class="bibref" rel="biblioentry" href="#bib-RDFA-CORE">RDFA-CORE</a>] is necessary to understand how 
-to implement this specification. WebID uses a number of specific technologies 
-like HTTP over TLS [<a class="bibref" rel="biblioentry" href="#bib-HTTP-TLS">HTTP-TLS</a>], X.509 certificates [<a class="bibref" rel="biblioentry" href="#bib-X509V3">X509V3</a>], 
-RDF/XML [<a class="bibref" rel="biblioentry" href="#bib-RDF-SYNTAX-GRAMMAR">RDF-SYNTAX-GRAMMAR</a>] and XHTML+RDFa [<a class="bibref" rel="biblioentry" href="#bib-XHTML-RDFA">XHTML-RDFA</a>].</p>
-
-<p>A general <a href="#introduction">Introduction</a> is provided for all that
-would like to understand why this specification is necessary to simplify usage
-of the Web.</p>
-
-<p>The terms used throughout this specification are listed in the section
-titled <a href="#terminology">Terminology</a>.</p>
-
-<p>Developers that are interested in implementing this specification will be
-most interested in the sections titled 
-<a href="#authentication-sequence">Authentication Sequence</a> and 
-<a href="#authentication-sequence-details">Authentication Sequence Details</a>.
-  
-</p></div>
-</div><div id="sotd" class="introductory section" typeof="bibo:Chapter" about="#sotd"><h2>Status of This Document</h2><p>This document is merely a public working draft of a potential specification. It has no official standing of any kind and does not represent the support or consensus of any standards organisation.</p>
-
-<!--  <p>This document has been reviewed by W3C Members, by software
-developers, and by other W3C groups and interested parties, and is
-endorsed by the Director as a W3C Recommendation. It is a stable
-document and may be used as reference material or cited from another
-document. W3C's role in making the Recommendation is to draw attention
-to the specification and to promote its widespread deployment. This
-enhances the functionality and interoperability of the Web.</p>  -->
-
-
-The source code for this document is available via Github at the following
-URL: <a href="http://github.com/msporny/webid-spec">http://github.com/msporny/webid-spec</a>
-
-</div><div id="toc" typeof="bibo:Chapter" about="#toc" class="section"><h2 class="introductory">Table of Contents</h2><ul class="toc"><li class="tocline"><a href="#introduction" class="tocxref"><span class="secno">1. </span>Introduction</a><ul class="toc"><li class="tocline"><a href="#motivation" class="tocxref"><span class="secno">1.1 </span>Motivation</a></li><li class="tocline"><a href="#relation-to-openid" class="tocxref"><span class="secno">1.2 </span>Relation to OpenID</a></li><li class="tocline"><a href="#relation-to-oauth" class="tocxref"><span class="secno">1.3 </span>Relation to OAuth</a></li></ul></li><li class="tocline"><a href="#the-webid-protocol" class="tocxref"><span class="secno">2. </span>The WebID Protocol</a><ul class="toc"><li class="tocline"><a href="#terminology" class="tocxref"><span class="secno">2.1 </span>Terminology</a></li><li class="tocline"><a href="#authentication-sequence" class="tocxref"><span class="secno">2.2 </span>Authentication Sequence</a></li><li class="tocline"><a href="#authentication-sequence-details" class="tocxref"><span class="secno">2.3 </span>Authentication Sequence Details</a><ul class="toc"><li class="tocline"><a href="#initiating-a-tls-connection" class="tocxref"><span class="secno">2.3.1 </span>Initiating a TLS Connection</a></li><li class="tocline"><a href="#exchanging-the-identification-certificate" class="tocxref"><span class="secno">2.3.2 </span>Exchanging the Identification Certificate</a></li><li class="tocline"><a href="#processing-the-webid-profile" class="tocxref"><span class="secno">2.3.3 </span>Processing the WebID Profile</a></li><li class="tocline"><a href="#extracting-webid-url-details" class="tocxref"><span class="secno">2.3.4 </span>Extracting WebID URL Details</a></li><li class="tocline"><a href="#authorization" class="tocxref"><span class="secno">2.3.5 </span>Authorization</a></li><li class="tocline"><a href="#secure-communication" class="tocxref"><span class="secno">2.3.6 </span>Secure Communication</a></li></ul></li><li class="tocline"><a href="#the-webid-profile" class="tocxref"><span class="secno">2.4 </span>The WebID Profile</a><ul class="toc"><li class="tocline"><a href="#personal-information" class="tocxref"><span class="secno">2.4.1 </span>Personal Information</a></li><li class="tocline"><a href="#cryptographic-details" class="tocxref"><span class="secno">2.4.2 </span>Cryptographic Details</a></li></ul></li></ul></li><li class="tocline"><a href="#references" class="tocxref"><span class="secno">A. </span>References</a><ul class="toc"><li class="tocline"><a href="#normative-references" class="tocxref"><span class="secno">A.1 </span>Normative references</a></li><li class="tocline"><a href="#informative-references" class="tocxref"><span class="secno">A.2 </span>Informative references</a></li></ul></li></ul></div>
-
-
-
-<div class="informative section" id="introduction" typeof="bibo:Chapter" about="#introduction">
-
-<!-- OddPage -->
-<h2><span class="secno">1. </span>Introduction</h2><p><em>This section is non-normative.</em></p>
-
-<p>
-The WebID specification is designed to help alleviate the difficultly that
-remembering different logins, passwords and settings for websites has created. 
-It is also designed to provide a universal and extensible mechanism to express 
-public and private information about yourself. This section outlines the 
-motivation behind the specification and the relationship to other similar 
-specifications that are in active use today.
-</p>
-
-<div class="informative section" id="motivation" typeof="bibo:Chapter" about="#motivation">
-<h3><span class="secno">1.1 </span>Motivation</h3><p><em>This section is non-normative.</em></p>
-
-<p>
-It is a fundamental design criteria of the Web to enable individuals and
-organizations to control how they interact with the rest of society. This
-includes how one expresses their identity, public information and personal 
-details to social networks, Web sites and services.
-</p>
-
-<p>
-Semantic Web vocabularies such as Friend-of-a-Friend (FOAF) permit distributed 
-hyperlinked social networks to exist. This vocabulary, along with other 
-vocabularies, allow one to add information and services protection to 
-distributed social networks.
-</p>
-
-<p>
-One major criticism of open networks is that they seem to have no way of
-protecting the personal information distributed on the web or limiting
-access to resources. Few people are willing to make all their personal
-information public, many would like large pieces to be protected, making
-it available only to a select group of agents. Giving access to
-information is very similar to giving access to services. There are many
-occasions when people would like services to only be accessible to
-members of a group, such as allowing only friends, family members,
-colleagues to post an article, photo or comment on a blog. How does one do
-this in a flexible way, without requiring a central point of
-access control?
-</p>
-
-<p>
-Using an process made popular by OpenID, we show how one can tie a User
-Agent to a URL by proving that one has write access to the URL. WebID is
-a simpler alternative to OpenID (fewer connections), that uses X.509 
-certificates to tie a User Agent (Browser) to a Person identified via a URL. 
-WebID also provides a few additional features to OpenID. These
-features include trust management, via digital signatures, and free-form 
-extensibility via RDFa. By using the existing SSL certificate exchange
-mechanism, WebID integrates more smoothly with existing Web browsers, including
-browsers on mobile devices. WebID also permits automated session login
-in addition to interactive session login. Additionally, all data is encrypted
-and guaranteed to only be received by the person or organization that was 
-intended to receive it.
-</p>
-
-</div>
-
-<div class="informative section" id="relation-to-openid" typeof="bibo:Chapter" about="#relation-to-openid">
-<h3><span class="secno">1.2 </span>Relation to OpenID</h3><p><em>This section is non-normative.</em></p>
-
-<p class="issue">This section needs to be re-written. The flow and grammar
-leaves much to be desired. -- manu</p>
-
-<p>WebID is compatible with OpenID. Both protocols use a URL that dereferences
-to a Personal Profile Document. This Personal Profile Document is where further
-information about an identity can be discovered. This mechanism is compatible
-with both WebID and OpenID. Therefore, WebID does not intend to replace OpenID, 
-but can work beside OpenID by sharing the content in the Personal Profile
-Document.</p>
-
-<p>That said, there are a number of benefits that WebID achieves over OpenID:
-</p>
-
-<p>WebID gives people and other agents a WebID URL for identification. OpenID 
-also provides a URL to a Personal Profile Document. However, in the case of 
-WebID, one does not need to remember the URL since the User Agent remembers
-the URL on behalf of the person browsing. To log in on a WebID web site there 
-is no need to enter any identifier like one has to do for OpenID. Just one click 
-tells the browser to send the WebID URL. The person that is browsing does 
-not need to remember either their WebID URL or the website password. The only 
-password one may need to remember is the one that is used to access their 
-collection of WebIDs in their browser, and that's only if they opt-in to 
-password protect their WebIDs.
-</p>
-
-<p>
-While WebID works well in a browser environment, it is also very useful outside
-of the browser environment. WebID can also operate without requiring the use
-of any passwords. This is useful to developers that may 
-want to use WebID to perform server-to-server or peer-to-peer verification of 
-identity. WebID works for automated agents such as Search Agents, API Agents,
-and other automated mechanisms that are often found outside of the browser
-environment.
-</p>
-
-<p>The WebID protocol requires just one direct network connection to establish
-identity via the client. The server requires one connection to the client and
-one connection to retrieve the WebID Profile if it does not have the credential
-information cached. Compare this to the much more complex OpenID sequence, which
-requires six connections by the client to establish a login. In a world of 
-distributed data where each site can point to data on any other site, multiple 
-connections become costly to manage.</p>
-
-<p>WebID builds on a number of well established Internet and Web standards;
-<a href="http://en.wikipedia.org/wiki/REST">REST</a>, 
-RDF [<a class="bibref" rel="biblioentry" href="#bib-RDF-PRIMER">RDF-PRIMER</a>], RDFa [<a class="bibref" rel="biblioentry" href="#bib-RDFA-CORE">RDFA-CORE</a>], RDF/XML [<a class="bibref" rel="biblioentry" href="#bib-RDF-SYNTAX-GRAMMAR">RDF-SYNTAX-GRAMMAR</a>], 
-TLS [<a class="bibref" rel="biblioentry" href="#bib-HTTP-TLS">HTTP-TLS</a>], and X.509 [<a class="bibref" rel="biblioentry" href="#bib-X509V3">X509V3</a>]. By building on previous standards, 
-it makes both explaining and implementing WebID easier on developers.</p>
-
-<p>Since WebID is RESTful, you can perform basic HTTP operations to 
-<code>GET</code> your WebID, and if you needed update it, you can use
-HTTP <code>PUT</code> semantics. You can also create a WebID via 
-<code>POST</code>. This is improved from the OpenID specification, which
-requires a new set of operations described in the OpenID Attribute Exchange
-specification.</p>
-
-<p>WebID is built on RDF and thus enables all of the advanced semantic web
-concepts that RDF enables. For example, a developer may perform machine
-reasoning with a WebID. One can construct machine-executable statements like
-"If this WebID claims to be a friend of one of our partner WebIDs that is
-trusted and the relationship is bi-directional, trust the WebID." 
-While OpenID attempts to support this use case by mapping OpenID to RDF, it's
-far easier to do with WebID because WebID is natively RDF-aware.</p>
-
-<p>It is easy to extend a WebID with new attributes via RDF. The power of
-RDF allows developers to add extensions to WebID by defining new
-vocabularies that they publish. There is no authorization process necessary
-and thus WebID allows for distributed innovation. Every WebID property is
-a URI, which when clicked, can give you yet more information about what the
-property means. A developer can create new usage classes by extending their
-vocabulary at will. A developer can add relationships to a WebID by simply
-adding more HTML to the developer's page. OpenID does not provide any type of
-distributed innovation akin to RDF.</p>
-
-<p>Implementing WebID is easier than OpenID because all of the basic 
-technologies have been working and integrated into Web browsers for many years. 
-There were already three interoperable implementations of WebID before this 
-specification was written.</p>
-
-<p>WebID is truly decentralized - with WebID you get a web of trust. 
-OpenID only supports the Web of Trust model if you indirectly trust the
-OpenID provider. In other words - OpenID is not truly decentralized. In OpenID
-you must trust OpenID providers. With WebID you only have to trust the people
-and the organizations with which you are communicating. In other words, you
-don't have to ask anyone whether or not you can trust your friends. You can
-query people that you trust directly to see if someone is trustworthy or not.
-There is no need for a central WebID authority.
-</p>
-
-<p>WebID is fully distributed, anyone can setup a WebID by placing a single
-file on a web server of their choosing. There is no need for a special 
-OpenID-like provider service. The only thing anyone that wants a WebID needs
-is a web account where you can post your WebID file, ideally on your own domain 
-name. You can also use a WebID hosting provider, but it's not necessary for
-WebID to work. While it is possible to run an OpenID server, other
-OpenID applications may not trust you and thus you won't be able to fully
-utilize your private OpenID credentials. The reason that there are a few
-large OpenID providers and very few small OpenID providers is because of this
-trust design issue related to OpenID.</p>
-
-<p>WebID does not require HTTP redirects. Redirects are problematic on many
-cell phones, because telecoms heavily rely on proxys, which selectively block
-redirects.</p>
-
-<p>A WebID provider is 100% compatible with an OpenID provider and thus can 
-inter-operate with OpenID-powered networks.</p>
-
-</div>
-
-<div class="informative section" id="relation-to-oauth" typeof="bibo:Chapter" about="#relation-to-oauth">
-<h3><span class="secno">1.3 </span>Relation to OAuth</h3><p><em>This section is non-normative.</em></p>
-
-<p>
-OAuth and WebID are mutually beneficial when used together. WebID can be
-used to provide RSA parameters to the RSA-SHA1 signature method required by
-OAuth 1.0. WebID can also be used to establish the consumer_key and HTTPS 
-connection that will be used to transmit OAuth Tokens in OAuth 2.0.
-</p>
-
-</div>
-</div>
-
-<div class="normative section" id="the-webid-protocol" typeof="bibo:Chapter" about="#the-webid-protocol">
-
-<!-- OddPage -->
-<h2><span class="secno">2. </span>The WebID Protocol</h2>
-
-<div class="normative section" id="terminology" typeof="bibo:Chapter" about="#terminology">
-<h3><span class="secno">2.1 </span>Terminology</h3>
-
-<dl>
-
-<dt><dfn title="Verification_Agent" id="dfn-verification_agent">Verification Agent</dfn></dt>
-<dd>Performs authentication on provided WebID credentials and determines if
-an <a class="tref internalDFN" title="Identification_Agent" href="#dfn-identification_agent">Identification Agent</a> can have access to a particular 
-resource. A <a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a> is typically a Web server, but 
-may also be a peer on a peer-to-peer network.</dd>
-
-<dt><dfn title="Identification_Agent" id="dfn-identification_agent">Identification Agent</dfn></dt>
-<dd>Provides identification credentials to a Verification Agent. The
-<a class="tref internalDFN" title="Identification_Agent" href="#dfn-identification_agent">Identification Agent</a> is typically also a User Agent.</dd>
-
-<dt><dfn title="Identification_Certificate" id="dfn-identification_certificate">Identification Certificate</dfn></dt>
-<dd>An X.509 [<a class="bibref" rel="biblioentry" href="#bib-X509V3">X509V3</a>] Certificate that <em class="rfc2119" title="must">must</em> contain a 
-<code>Subject Alternative Name</code> extension with a URI entry. The URI
-<em class="rfc2119" title="should">should</em> be a URL, and <em class="rfc2119" title="should not">should not</em> be a URN. The URL
-identifies the <a class="tref internalDFN" title="Identification_Agent" href="#dfn-identification_agent">Identification Agent</a>. The URL <em class="rfc2119" title="must">must</em> be 
-dereference-able and result in a document containing RDF data. For example, 
-the certificate would contain <code>http://example.org/webid#public</code>,
-known as a <a class="tref internalDFN" title="WebID_URL" href="#dfn-webid_url">WebID URL</a>, as the <code>Subject Alternative Name</code>:
-<code><pre>
-X509v3 extensions:
-   ...
-   X509v3 Subject Alternative Name:
-      URI:http://example.org/webid#public
-</pre></code>
-
-</dd><dt><dfn title="WebID_URL" id="dfn-webid_url">WebID URL</dfn></dt>
-<dd>A URL specified via the <code>Subject Alternative Name</code> extension 
-of the <a class="tref internalDFN" title="Identification_Certificate" href="#dfn-identification_certificate">Identification Certificate</a> that identifies an 
-<a class="tref internalDFN" title="Identification_Agent" href="#dfn-identification_agent">Identification Agent</a>.</dd>
-
-<dt><dfn title="public_key" id="dfn-public_key">public key</dfn></dt>
-<dd>A widely distributed crytographic key that can be used to verify 
-digital signatures and encrypt data between a sender and a receiver. A public
-key is always included in an <a class="tref internalDFN" title="Identification_Certificate" href="#dfn-identification_certificate">Identification Certificate</a></dd>
-
-<dt><dfn title="WebID_Profile" id="dfn-webid_profile">WebID Profile</dfn></dt>
-<dd>
-A structured document that contains identification credentials for the 
-<a class="tref internalDFN" title="Identification_Agent" href="#dfn-identification_agent">Identification Agent</a> expressed using the Resource Description
-Framework [<a class="bibref" rel="biblioentry" href="#bib-RDF-CONCEPTS">RDF-CONCEPTS</a>]. Either the XHTML+RDFa 1.1 [<a class="bibref" rel="biblioentry" href="#bib-XHTML-RDFA">XHTML-RDFA</a>] 
-serialization format or the RDF/XML [<a class="bibref" rel="biblioentry" href="#bib-RDF-SYNTAX-GRAMMAR">RDF-SYNTAX-GRAMMAR</a>] serialization
-format <em class="rfc2119" title="must">must</em> be supported by the mechanism, e.g. a Web Service, providing the
-WebID Profile document. Alternate RDF serialization
-formats, such as N3 [<a class="bibref" rel="biblioentry" href="#bib-N3">N3</a>] or Turtle [<a class="bibref" rel="biblioentry" href="#bib-TURTLE">TURTLE</a>], <em class="rfc2119" title="may">may</em> be supported by the 
-mechanism providing the WebID Profile document.
-</dd>
-
-</dl>
-
-<p class="issue">Whether or not RDF/XML, XHTML+RDFa 1.1, both or neither
-serialization of RDF should be required serialization formats in the 
-specification is currently under heavy debate.</p>
-
-</div>
-
-<div class="normative section" id="authentication-sequence" typeof="bibo:Chapter" about="#authentication-sequence">
-<h3><span class="secno">2.2 </span>Authentication Sequence</h3>
-
-<p>The following steps are executed by Verification Agents and Identification
-Agents to determine if access should be granted to a particular resource.
-</p>
-
-<ol>
-<li>The <a class="tref internalDFN" title="Identification_Agent" href="#dfn-identification_agent">Identification Agent</a> attempts to access a resource
-using HTTP over TLS [<a class="bibref" rel="biblioentry" href="#bib-HTTP-TLS">HTTP-TLS</a>] via the <a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a>.</li>
-
-<li>The <a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a> <em class="rfc2119" title="must">must</em> request the 
-<a class="tref internalDFN" title="Identification_Certificate" href="#dfn-identification_certificate">Identification Certificate</a> of the <a class="tref internalDFN" title="Identification_Agent" href="#dfn-identification_agent">Identification Agent</a>
-as a part of the TLS client-cerificate retrieval protocol.</li>
-
-<li>The <a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a> <em class="rfc2119" title="must">must</em> extract the <a class="tref internalDFN" title="public_key" href="#dfn-public_key">public key</a> and the
-<a class="tref internalDFN" title="WebID_URL" href="#dfn-webid_url">WebID URL</a> contained in the <code>Subject Alternative Name</code> 
-extension of the <a class="tref internalDFN" title="Identification_Certificate" href="#dfn-identification_certificate">Identification Certificate</a>.</li>
-
-<li>The <a class="tref internalDFN" title="public_key" href="#dfn-public_key">public key</a> information associated with the 
-<a class="tref internalDFN" title="WebID_URL" href="#dfn-webid_url">WebID URL</a> <em class="rfc2119" title="must">must</em> be checked by the <a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a>. 
-This process <em class="rfc2119" title="should">should</em> occur either by dereferencing the <a class="tref internalDFN" title="WebID_URL" href="#dfn-webid_url">WebID URL</a> and 
-extracting RDF data from the resulting document, or by utilizing a cached 
-version of the RDF data contained in the document or other data source that is 
-up-to-date and trusted by the <a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a>. The processing
-and extraction mechanism is further detailed in the sections titled 
-<a href="#processing-the-webid-profile">Processing the WebID Profile</a> and
-<a href="#extracting-webid-url-details">Extracting WebID URL Details</a>.
-</li>
-
-<li>If the <a class="tref internalDFN" title="public_key" href="#dfn-public_key">public key</a> in the 
-<a class="tref internalDFN" title="Identification_Certificate" href="#dfn-identification_certificate">Identification Certificate</a> is found in the list of 
-<a class="tref internalDFN" title="public_key" href="#dfn-public_key">public key</a>s associated with the <a class="tref internalDFN" title="WebID_URL" href="#dfn-webid_url">WebID URL</a>, the 
-<a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a> <em class="rfc2119" title="must">must</em> assume that the client intends to use
-the <a class="tref internalDFN" title="public_key" href="#dfn-public_key">public key</a> to verify their ownership of the WebID URL.</li>
-
-<li>
-The <a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a> verifies that the 
-<a class="tref internalDFN" title="Identification_Agent" href="#dfn-identification_agent">Identification Agent</a> owns the <a class="tref internalDFN" title="WebID_Profile" href="#dfn-webid_profile">WebID Profile</a> 
-by using the <a class="tref internalDFN" title="public_key" href="#dfn-public_key">public key</a> to create a cryptographic challenge. 
-The challenge <em class="rfc2119" title="should">should</em> be fulfilled by performing TLS mutual-authentication
-between the <a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a> and the 
-<a class="tref internalDFN" title="Identification_Agent" href="#dfn-identification_agent">Identification Agent</a>. 
-If the <a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a> does not have access to the TLS layer, 
-a digital signature challenge <em class="rfc2119" title="must">must</em> be provided by the 
-<a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a>. These processes are detailed in the sections 
-titled <a href="#authorization">Authorization</a> and 
-<a href="#secure-communication">Secure Communication</a>.</li>
-
-</ol>
-
-<p>
-The <a class="tref internalDFN" title="Identification_Agent" href="#dfn-identification_agent">Identification Agent</a> <em class="rfc2119" title="may">may</em> re-establish a different identity at 
-any time by executing all of the steps in the Authentication Sequence again. 
-Additional algorithms, detailed in the next section, <em class="rfc2119" title="may">may</em> be performed to 
-determine if the <a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a> can access a particular 
-resource after the last step of the Authentication Sequence has been
-completed.
-</p>
-
-</div>
-
-<div class="normative section" id="authentication-sequence-details" typeof="bibo:Chapter" about="#authentication-sequence-details">
-<h3><span class="secno">2.3 </span>Authentication Sequence Details</h3>
-
-<p>This section covers details about each step in the authentication process.
-</p>
-
-<div class="normative section" id="initiating-a-tls-connection" typeof="bibo:Chapter" about="#initiating-a-tls-connection">
-<h4><span class="secno">2.3.1 </span>Initiating a TLS Connection</h4>
-
-<p class="issue">This section will detail how the TLS connection process is
-started and used by WebID to create a secure channel between the 
-Identification Agent and the Verification Agent.</p>
-</div>
-
-<div class="normative section" id="exchanging-the-identification-certificate" typeof="bibo:Chapter" about="#exchanging-the-identification-certificate">
-<h4><span class="secno">2.3.2 </span>Exchanging the Identification Certificate</h4>
-
-<p class="issue">This section will detail how the certificate is selected and
-sent to the Verification Agent.</p>
-</div>
-
-<div class="normative section" id="processing-the-webid-profile" typeof="bibo:Chapter" about="#processing-the-webid-profile">
-<h4><span class="secno">2.3.3 </span>Processing the WebID Profile</h4>
-
-<p>A Verification Agent <em class="rfc2119" title="must">must</em> be able to process documents in RDF/XML 
-[<a class="bibref" rel="biblioentry" href="#bib-RDF-SYNTAX-GRAMMAR">RDF-SYNTAX-GRAMMAR</a>] and XHTML+RDFa [<a class="bibref" rel="biblioentry" href="#bib-XHTML-RDFA">XHTML-RDFA</a>]. A server responding to 
-a WebID Profile request <em class="rfc2119" title="should">should</em> support HTTP content negotiation. The server
-<em class="rfc2119" title="must">must</em> return a representation in RDF/XML for media type
-<code>application/rdf+xml</code>.
-The server <em class="rfc2119" title="must">must</em> return a representation in XHTML+RDFa for media type
-<code>text/html</code> or media type 
-<code>application/xhtml+xml</code>. <a class="tref" title="Verification_Agents">Verification Agents</a> and 
-<a class="tref" title="Identification_Agents">Identification Agents</a> <em class="rfc2119" title="may">may</em> support any other RDF format via 
-HTTP content negotiation.
-</p> 
-
-<p class="issue">This section will explain how a Verification Agent extracts 
-semantic data describing the identification credentials from a WebID Profile.</p>
-</div>
-
-<div class="normative section" id="extracting-webid-url-details" typeof="bibo:Chapter" about="#extracting-webid-url-details">
-<h4><span class="secno">2.3.4 </span>Extracting WebID URL Details</h4>
-
-<p>
-The <a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a> may use a number of different methods to
-extract the <a class="tref internalDFN" title="public_key" href="#dfn-public_key">public key</a> information from the <a class="tref internalDFN" title="WebID_Profile" href="#dfn-webid_profile">WebID Profile</a>.
-</p>
-The following SPARQL query outlines one way in which the <a class="tref internalDFN" title="public_key" href="#dfn-public_key">public key</a>
-could be extracted from the <a class="tref internalDFN" title="WebID_Profile" href="#dfn-webid_profile">WebID Profile</a>:
-<code><pre>
-PREFIX cert: &lt;http://www.w3.org/ns/auth/cert#&gt;
-PREFIX rsa: &lt;http://www.w3.org/ns/auth/rsa#&gt;
-SELECT ?modulus ?exp
-WHERE {
-   ?key cert:identity &lt;http://example.org/webid#public&gt;;
-      a rsa:RSAPublicKey;
-      rsa:modulus [ cert:hex ?modulus; ];
-      rsa:public_exponent [ cert:decimal ?exp ] .
-}
-</pre></code>
-
-<p class="issue">This section still needs more information.</p>
-
-</div>
-
-<div class="normative section" id="authorization" typeof="bibo:Chapter" about="#authorization">
-<h4><span class="secno">2.3.5 </span>Authorization</h4>
-
-<p class="issue">This section will explain how a Verification Agent may
-use the information discovered via a WebID URL to determine if one should
-be able to access a particular resource. It will explain how a Verification
-Agent can use links to other RDFa documents to build knowledge about the
-given WebID.</p>
-
-</div>
-
-<div class="normative section" id="secure-communication" typeof="bibo:Chapter" about="#secure-communication">
-<h4><span class="secno">2.3.6 </span>Secure Communication</h4>
-
-<p class="issue">This section will explain how an Identification Agent and
-a Verification Agent may communicate securely using a set of verified
-identification credentials.</p>
-
-<p>
-If the <a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a> has verified that the
-<a class="tref internalDFN" title="WebID_Profile" href="#dfn-webid_profile">WebID Profile</a> is owned by the <a class="tref internalDFN" title="Identification_Agent" href="#dfn-identification_agent">Identification Agent</a>, 
-the <a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a> <em class="rfc2119" title="should">should</em> use the verified 
-<a class="tref internalDFN" title="public_key" href="#dfn-public_key">public key</a> contained in the <a class="tref internalDFN" title="Identification_Certificate" href="#dfn-identification_certificate">Identification Certificate</a> 
-for all TLS-based communication with the <a class="tref internalDFN" title="Identification_Agent" href="#dfn-identification_agent">Identification Agent</a>.
-This ensures that both the <a class="tref" title="Authorization_Agent">Authorization Agent</a> and the 
-<a class="tref internalDFN" title="Identification_Agent" href="#dfn-identification_agent">Identification Agent</a>
-are communicating in a secure manner, ensuring cryptographically protected
-privacy for both sides.
-</p>
-
-</div>
-
-</div>
-
-<div class="normative section" id="the-webid-profile" typeof="bibo:Chapter" about="#the-webid-profile">
-<h3><span class="secno">2.4 </span>The WebID Profile</h3>
-
-<p>The <a class="tref internalDFN" title="WebID_Profile" href="#dfn-webid_profile">WebID Profile</a> is a structured document that contains 
-identification credentials for the <a class="tref internalDFN" title="Identification_Agent" href="#dfn-identification_agent">Identification Agent</a> expressed 
-using the Resource Description Framework [<a class="bibref" rel="biblioentry" href="#bib-RDF-CONCEPTS">RDF-CONCEPTS</a>]. The following 
-sections describe how to express certain common properties that could be used
-by <a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a>s and other entities that consume a 
-<a class="tref internalDFN" title="WebID_Profile" href="#dfn-webid_profile">WebID Profile</a>.</p>
-
-<p>The following vocabularies are used in their shortened form in the 
-subsequent sections:</p>
-
-<dl>
-  <dt>foaf</dt>
-  <dd>http://xmlns.com/foaf/0.1/</dd>
-  <dt>cert</dt>
-  <dd>http://www.w3.org/ns/auth/cert#</dd>
-  <dt>rsa</dt>
-  <dd>http://www.w3.org/ns/auth/rsa#</dd>
-</dl>
-
-<div class="normative section" id="personal-information" typeof="bibo:Chapter" about="#personal-information">
-<h4><span class="secno">2.4.1 </span>Personal Information</h4>
-
-<p>Personal details are the most common requirement when registering an 
-account with a website. Some of these pieces of information include an e-mail 
-address, a name and perhaps an avatar image. This section includes
-properties that <em class="rfc2119" title="should">should</em> be used when conveying key pieces of personal 
-information but are <em class="rfc2119" title="not required">not required</em> to be present in a WebID Profile:</p>
-
-<dl>
-  <dt>foaf:mbox</dt>
-  <dd>The e-mail address that is associated with the WebID URL.</dd>
-  <dt>foaf:name</dt>
-  <dd>The name that is most commonly used to refer to the individual 
-    or agent.</dd>
-  <dt>foaf:depiction</dt>
-  <dd>An image representation of the individual or agent.</dd>
-</dl>
-</div>
-
-<div class="normative section" id="cryptographic-details" typeof="bibo:Chapter" about="#cryptographic-details">
-<h4><span class="secno">2.4.2 </span>Cryptographic Details</h4>
-
-<p>Cryptographic details are important when <a class="tref internalDFN" title="Verification_Agent" href="#dfn-verification_agent">Verification Agent</a>s
-and <a class="tref internalDFN" title="Identification_Agent" href="#dfn-identification_agent">Identification Agent</a>s interact. The following properties 
-<em class="rfc2119" title="should">should</em> be used when conveying cryptographic information in WebID Profile
-documents:</p>
-
-<dl>
-  <dt>rsa:RSAPublicKey</dt>
-  <dd>Expresses an RSA public key. The RSAPublicKey <em class="rfc2119" title="must">must</em> specify the
-  rsa:modulus and rsa:public_exponent properties.</dd>
-  <dt>cert:identity</dt>
-  <dd>Used to associate an RSAPublicKey with a WebID URL. A WebID Profile
-  <em class="rfc2119" title="must">must</em> contain at least one RSAPublicKey that is associated with the
-  corresponding WebID URL.</dd>
-</dl>
-</div>
-
-</div>
-
-<div id="appendix" typeof="bibo:Chapter" about="#appendix" class="section">
-
-<div class="informative section" id="history" typeof="bibo:Chapter" about="#history">
-<h4>Change History</h4><p><em>This section is non-normative.</em></p>
-<p><a href="http://github.com/msporny/webid-spec/commit/b19d2812901b4511fdf9876c1be53bb36ee3201e">2010-07-25</a> Added WebID Profile section.</p>
-<p><a href="http://github.com/msporny/webid-spec/commit/211d197510ca119c21ae48f3e5aa3f931ea88672">2010-07-18</a> Updates from WebID community related to RDF/XML support, authentication sequence corrections, abstract and introduction updates.</p>
-<p><a href="http://github.com/msporny/webid-spec/commit/a54dee9c242b08edaac617d678215b389dd3556d">2010-07-11</a> Initial version.</p>
-</div>
-
-<div class="informative section" id="acknowledgements" typeof="bibo:Chapter" about="#acknowledgements">
-<h4>Acknowledgments</h4><p><em>This section is non-normative.</em></p>
-
-<p>The following people have been instrumental in providing thoughts, feedback,
-reviews, criticism and input in the creation of this specification:</p>
-
-<ul>
-<li>Melvin Carvalho</li>
-<li>Bruno Harbulot</li>
-<li>Toby Inkster</li>
-<li>Ian Jacobi</li>
-<li>Jeff Sayre</li>
-<li>Henry Story</li>
-</ul>
-
-</div>
-</div>
-  
-
-
-</div><div id="references" class="appendix section" typeof="bibo:Chapter" about="#references">
-<!-- OddPage -->
-<h2><span class="secno">A. </span>References</h2><div id="normative-references" typeof="bibo:Chapter" about="#normative-references" class="section"><h3><span class="secno">A.1 </span>Normative references</h3><dl class="bibliography" about=""><dt id="bib-HTTP-TLS">[HTTP-TLS]</dt><dd rel="dcterms:requires">E. Rescorla. <a href="http://www.ietf.org/rfc/rfc2818.txt"><cite>HTTP Over TLS.</cite></a> May 2000. Internet RFC 2818. URL: <a href="http://www.ietf.org/rfc/rfc2818.txt">http://www.ietf.org/rfc/rfc2818.txt</a> 
-</dd><dt id="bib-N3">[N3]</dt><dd rel="dcterms:requires">Tim Berners-Lee; Dan Connolly. <a href="http://www.w3.org/TeamSubmission/2008/SUBM-n3-20080114/"><cite>Notation3 (N3): A readable RDF syntax.</cite></a> 14 January 2008. W3C Team Submission. URL: <a href="http://www.w3.org/TeamSubmission/2008/SUBM-n3-20080114/">http://www.w3.org/TeamSubmission/2008/SUBM-n3-20080114/</a> 
-</dd><dt id="bib-RDF-PRIMER">[RDF-PRIMER]</dt><dd rel="dcterms:requires">Frank Manola; Eric Miller. <a href="http://www.w3.org/TR/2004/REC-rdf-primer-20040210/"><cite>RDF Primer.</cite></a> 10 February 2004. W3C Recommendation. URL: <a href="http://www.w3.org/TR/2004/REC-rdf-primer-20040210/">http://www.w3.org/TR/2004/REC-rdf-primer-20040210/</a> 
-</dd><dt id="bib-RDF-SYNTAX-GRAMMAR">[RDF-SYNTAX-GRAMMAR]</dt><dd rel="dcterms:requires">Dave Beckett. <a href="http://www.w3.org/TR/2004/REC-rdf-syntax-grammar-20040210"><cite>RDF/XML Syntax Specification (Revised).</cite></a> 10 February 2004. W3C Recommendation. URL: <a href="http://www.w3.org/TR/2004/REC-rdf-syntax-grammar-20040210">http://www.w3.org/TR/2004/REC-rdf-syntax-grammar-20040210</a> 
-</dd><dt id="bib-RDFA-CORE">[RDFA-CORE]</dt><dd rel="dcterms:requires">Shane McCarron; et al. <a href="http://www.w3.org/TR/2010/WD-rdfa-core-20100422"><cite>RDFa Core 1.1: Syntax and processing rules for embedding RDF through attributes.</cite></a>22 April 2010. W3C Working Draft. URL: <a href="http://www.w3.org/TR/2010/WD-rdfa-core-20100422">http://www.w3.org/TR/2010/WD-rdfa-core-20100422</a> 
-</dd><dt id="bib-TURTLE">[TURTLE]</dt><dd rel="dcterms:requires">David Beckett, Tim Berners-Lee. <a href="http://www.w3.org/TeamSubmission/turtle/">Turtle: Terse RDF Triple Language</a> January 2008. W3C Team Submission. URL: <a href="http://www.w3.org/TeamSubmission/turtle/">http://www.w3.org/TeamSubmission/turtle/</a> 
-</dd><dt id="bib-X509V3">[X509V3]</dt><dd rel="dcterms:requires"><cite>ITU-T Recommendation X.509 version 3 (1997). "Information Technology - Open Systems Interconnection - The Directory Authentication Framework"  ISO/IEC 9594-8:1997</cite>.
-</dd><dt id="bib-XHTML-RDFA">[XHTML-RDFA]</dt><dd rel="dcterms:requires">Shane McCarron; et. al. <a href="http://www.w3.org/TR/2010/WD-xhtml-rdfa-20100422"><cite>XHTML+RDFa 1.1.</cite></a> 22 April 2010. W3C Working Draft. URL: <a href="http://www.w3.org/TR/2010/WD-xhtml-rdfa-20100422">http://www.w3.org/TR/WD-xhtml-rdfa-20100422</a> 
-</dd></dl></div><div id="informative-references" typeof="bibo:Chapter" about="#informative-references" class="section"><h3><span class="secno">A.2 </span>Informative references</h3><dl class="bibliography" about=""><dt id="bib-RDF-CONCEPTS">[RDF-CONCEPTS]</dt><dd rel="dcterms:references">Graham Klyne; Jeremy J. Carroll. <a href="http://www.w3.org/TR/2004/REC-rdf-concepts-20040210"><cite>Resource Description Framework (RDF): Concepts and Abstract Syntax.</cite></a> 10 February 2004. W3C Recommendation. URL: <a href="http://www.w3.org/TR/2004/REC-rdf-concepts-20040210">http://www.w3.org/TR/2004/REC-rdf-concepts-20040210</a> 
-</dd></dl></div></div></body></html>