--- a/ED/html-data-guide/20120104/index.html Wed Jan 04 15:12:56 2012 -0500
+++ b/ED/html-data-guide/20120104/index.html Wed Jan 04 15:25:45 2012 -0500
@@ -478,8 +478,8 @@
pre.sh_sourceCode .sh_paren { color: red; }
pre.sh_sourceCode .sh_attribute { color: #006400; }
-</style><link href="http://www.w3.org/StyleSheets/TR/W3C-ED" rel="stylesheet" type="text/css" charset="utf-8" /></head>
- <body style="display: inherit; "><div class="head"><p><a href="http://www.w3.org/"><img width="72" height="48" src="http://www.w3.org/Icons/w3c_home" alt="W3C" /></a></p><h1 class="title" id="title">HTML Data Guide</h1><h2 id="w3c-editor-s-draft-04-january-2012"><acronym title="World Wide Web Consortium">W3C</acronym> Editor's Draft 04 January 2012</h2><dl><dt>This version:</dt><dd><a href="https://dvcs.w3.org/hg/htmldata/raw-file/default/html-data-guide/index.html">https://dvcs.w3.org/hg/htmldata/raw-file/default/html-data-guide/index.html</a></dd><dt>Latest published version:</dt><dd><a href="http://www.w3.org/TR/html-data-guide/">http://www.w3.org/TR/html-data-guide/</a></dd><dt>Latest editor's draft:</dt><dd><a href="https://dvcs.w3.org/hg/htmldata/raw-file/default/html-data-guide/index.html">https://dvcs.w3.org/hg/htmldata/raw-file/default/html-data-guide/index.html</a></dd><dt>Previous version:</dt><dd>none</dd><dt>Editor:</dt><dd><a href="http://www.jenitennison.com/blog/">Jeni Tennison</a>, Independent</dd>
+</style><link href="http://www.w3.org/StyleSheets/TR/W3C-NOTE" rel="stylesheet" type="text/css" charset="utf-8" /></head>
+ <body style="display: inherit; "><div class="head"><p><a href="http://www.w3.org/"><img width="72" height="48" src="http://www.w3.org/Icons/w3c_home" alt="W3C" /></a></p><h1 class="title" id="title">HTML Data Guide</h1><h2 id="w3c-note-04-january-2012"><acronym title="World Wide Web Consortium">W3C</acronym> Note 04 January 2012</h2><dl><dt>This version:</dt><dd><a href="http://www.w3.org/TR/2012/NOTE-html-data-guide-20120104/">http://www.w3.org/TR/2012/NOTE-html-data-guide-20120104/</a></dd><dt>Latest published version:</dt><dd><a href="http://www.w3.org/TR/html-data-guide/">http://www.w3.org/TR/html-data-guide/</a></dd><dt>Latest editor's draft:</dt><dd><a href="https://dvcs.w3.org/hg/htmldata/raw-file/default/html-data-guide/index.html">https://dvcs.w3.org/hg/htmldata/raw-file/default/html-data-guide/index.html</a></dd><dt>Previous version:</dt><dd>none</dd><dt>Editor:</dt><dd><a href="http://www.jenitennison.com/blog/">Jeni Tennison</a>, Independent</dd>
</dl><p class="copyright"><a href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> © 2012 <a href="http://www.w3.org/"><acronym title="World Wide Web Consortium">W3C</acronym></a><sup>®</sup> (<a href="http://www.csail.mit.edu/"><acronym title="Massachusetts Institute of Technology">MIT</acronym></a>, <a href="http://www.ercim.eu/"><acronym title="European Research Consortium for Informatics and Mathematics">ERCIM</acronym></a>, <a href="http://www.keio.ac.jp/">Keio</a>), All Rights Reserved. <acronym title="World Wide Web Consortium">W3C</acronym> <a href="http://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>, <a href="http://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a> and <a href="http://www.w3.org/Consortium/Legal/copyright-documents">document use</a> rules apply.</p><hr /></div>
<div id="abstract" class="introductory section"><h2>Abstract</h2>
<p>
@@ -488,7 +488,7 @@
<p>
This guide aims to help publishers and consumers of HTML data use it well. With several <a title="syntax" href="#dfn-syntax" class="internalDFN">syntaxes</a> and <a title="vocabulary" href="#dfn-vocabulary" class="internalDFN">vocabularies</a> to choose from, it provides guidance about how to decide which meets the publisher's or consumer's needs. It discusses when it is necessary to mix syntaxes and vocabularies and how to publish and consume data that uses multiple formats. It describes how to create vocabularies that can be used in multiple syntaxes and general best practices about the publication and consumption of HTML data.
</p>
- </div><div id="sotd" class="introductory section"><h2>Status of This Document</h2><p><em>This section describes the status of this document at the time of its publication. Other documents may supersede this document. A list of current <acronym title="World Wide Web Consortium">W3C</acronym> publications and the latest revision of this technical report can be found in the <a href="http://www.w3.org/TR/"><acronym title="World Wide Web Consortium">W3C</acronym> technical reports index</a> at http://www.w3.org/TR/.</em></p><p>This document was published by the <a href="http://www.w3.org/wiki/Html-data-tf">HTML Data Task Force</a> as an Editor's Draft. If you wish to make comments regarding this document, please send them to <a href="mailto:public-html-data-tf@w3.org">public-html-data-tf@w3.org</a> (<a href="mailto:public-html-data-tf-request@w3.org?subject=subscribe">subscribe</a>, <a href="http://lists.w3.org/Archives/Public/public-html-data-tf/">archives</a>). All feedback is welcome.</p><p>Publication as an Editor's Draft does not imply endorsement by the <acronym title="World Wide Web Consortium">W3C</acronym> Membership. This is a draft document and may be updated, replaced or obsoleted by other documents at any time. It is inappropriate to cite this document as other than work in progress.</p><p>This document was produced by a group operating under the <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/">5 February 2004 <acronym title="World Wide Web Consortium">W3C</acronym> Patent Policy</a>. <acronym title="World Wide Web Consortium">W3C</acronym> maintains a <a href="" rel="disclosure">public list of any patent disclosures</a> made in connection with the deliverables of the group; that page also includes instructions for disclosing a patent. An individual who has actual knowledge of a patent which the individual believes contains <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#def-essential">Essential Claim(s)</a> must disclose the information in accordance with <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#sec-Disclosure">section 6 of the <acronym title="World Wide Web Consortium">W3C</acronym> Patent Policy</a>.</p></div><div id="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="#scope" class="tocxref"><span class="secno">1.1 </span>Scope</a></li><li class="tocline"><a href="#terminology" class="tocxref"><span class="secno">1.2 </span>Terminology</a></li></ul></li><li class="tocline"><a href="#publishers" class="tocxref"><span class="secno">2. </span>Publishers</a><ul class="toc"><li class="tocline"><a href="#choosing-a-publishing-format" class="tocxref"><span class="secno">2.1 </span>Choosing a Publishing Format</a><ul class="toc"><li class="tocline"><a href="#syntax-considerations" class="tocxref"><span class="secno">2.1.1 </span>Syntax Considerations</a></li><li class="tocline"><a href="#vocabulary-considerations" class="tocxref"><span class="secno">2.1.2 </span>Vocabulary Considerations</a></li><li class="tocline"><a href="#usability-considerations" class="tocxref"><span class="secno">2.1.3 </span>Usability Considerations</a></li></ul></li><li class="tocline"><a href="#publishing-in-multiple-formats" class="tocxref"><span class="secno">2.2 </span>Publishing in Multiple Formats</a><ul class="toc"><li class="tocline"><a href="#mixing-vocabularies" class="tocxref"><span class="secno">2.2.1 </span>Mixing Vocabularies</a><ul class="toc"><li class="tocline"><a href="#mixing-vocabularies-in-microformats" class="tocxref"><span class="secno">2.2.1.1 </span>Mixing Vocabularies in Microformats</a></li><li class="tocline"><a href="#mixing-vocabularies-in-rdfa" class="tocxref"><span class="secno">2.2.1.2 </span>Mixing Vocabularies in RDFa</a></li><li class="tocline"><a href="#mixing-vocabularies-microdata" class="tocxref"><span class="secno">2.2.1.3 </span>Mixing Vocabularies in Microdata</a></li></ul></li><li class="tocline"><a href="#mixing-syntaxes" class="tocxref"><span class="secno">2.2.2 </span>Mixing Syntaxes</a><ul class="toc"><li class="tocline"><a href="#dates-and-times" class="tocxref"><span class="secno">2.2.2.1 </span>Dates and Times</a></li><li class="tocline"><a href="#link-relations" class="tocxref"><span class="secno">2.2.2.2 </span>Link relations</a></li><li class="tocline"><a href="#microdata-and-rdfa-equivalencies" class="tocxref"><span class="secno">2.2.2.3 </span>Microdata and RDFa Equivalencies</a></li><li class="tocline"><a href="#properties-within-links" class="tocxref"><span class="secno">2.2.2.4 </span>Properties Within Links</a></li><li class="tocline"><a href="#datatypes" class="tocxref"><span class="secno">2.2.2.5 </span>Datatypes</a></li><li class="tocline"><a href="#iris" class="tocxref"><span class="secno">2.2.2.6 </span>IRIs</a></li></ul></li></ul></li><li class="tocline"><a href="#good-publishing-practice" class="tocxref"><span class="secno">2.3 </span>Good Publishing Practice</a><ul class="toc"><li class="tocline"><a href="#valid-html" class="tocxref"><span class="secno">2.3.1 </span>Valid HTML</a></li><li class="tocline"><a href="#context-independence" class="tocxref"><span class="secno">2.3.2 </span>Context Independence</a></li><li class="tocline"><a href="#testing" class="tocxref"><span class="secno">2.3.3 </span>Testing</a></li><li class="tocline"><a href="#clear-licensing" class="tocxref"><span class="secno">2.3.4 </span>Clear Licensing</a></li></ul></li></ul></li><li class="tocline"><a href="#consumers" class="tocxref"><span class="secno">3. </span>Consumers</a><ul class="toc"><li class="tocline"><a href="#choosing-a-syntax-to-consume" class="tocxref"><span class="secno">3.1 </span>Choosing a Syntax to Consume</a><ul class="toc"><li class="tocline"><a href="#application-considerations" class="tocxref"><span class="secno">3.1.1 </span>Application Considerations</a></li><li class="tocline"><a href="#tooling-considerations" class="tocxref"><span class="secno">3.1.2 </span>Tooling Considerations</a><ul class="toc"><li class="tocline"><a href="#microdata-microformats-2-data-model" class="tocxref"><span class="secno">3.1.2.1 </span>Microdata/Microformats-2 Data Model</a></li><li class="tocline"><a href="#rdf-data-model" class="tocxref"><span class="secno">3.1.2.2 </span>RDF Data Model</a></li></ul></li><li class="tocline"><a href="#data-model-considerations" class="tocxref"><span class="secno">3.1.3 </span>Data Model Considerations</a></li><li class="tocline"><a href="#usability-considerations-1" class="tocxref"><span class="secno">3.1.4 </span>Usability Considerations</a></li></ul></li><li class="tocline"><a href="#consuming-multiple-formats" class="tocxref"><span class="secno">3.2 </span>Consuming Pages with Multiple Formats</a></li><li class="tocline"><a href="#good-consumption-practice" class="tocxref"><span class="secno">3.3 </span>Good Consumption Practice</a></li></ul></li><li class="tocline"><a href="#vocabulary-authors" class="tocxref"><span class="secno">4. </span>Vocabulary Authors</a><ul class="toc"><li class="tocline"><a href="#extending-vocabularies" class="tocxref"><span class="secno">4.1 </span>Extending Vocabularies</a><ul class="toc"><li class="tocline"><a href="#extending-microformats" class="tocxref"><span class="secno">4.1.1 </span>Extending Microformats</a></li><li class="tocline"><a href="#extending-rdf-vocabularies" class="tocxref"><span class="secno">4.1.2 </span>Extending RDF Vocabularies</a></li><li class="tocline"><a href="#extending-microdata-vocabularies" class="tocxref"><span class="secno">4.1.3 </span>Extending Microdata Vocabularies</a></li></ul></li><li class="tocline"><a href="#designing-vocabularies" class="tocxref"><span class="secno">4.2 </span>Designing Vocabularies</a><ul class="toc"><li class="tocline"><a href="#syntax-specific-requirements" class="tocxref"><span class="secno">4.2.1 </span>Syntax-Specific Requirements</a><ul class="toc"><li class="tocline"><a href="#microformat-vocabularies" class="tocxref"><span class="secno">4.2.1.1 </span>Microformat Vocabularies</a></li><li class="tocline"><a href="#microdata-vocabularies" class="tocxref"><span class="secno">4.2.1.2 </span>Microdata Vocabularies</a></li><li class="tocline"><a href="#rdfa-vocabularies" class="tocxref"><span class="secno">4.2.1.3 </span>RDFa Vocabularies</a></li></ul></li><li class="tocline"><a href="#syntax-neutral-vocabularies" class="tocxref"><span class="secno">4.2.2 </span>Syntax-Neutral Vocabularies</a></li><li class="tocline"><a href="#good-vocabulary-design-practices" class="tocxref"><span class="secno">4.2.3 </span>Good Vocabulary Design Practices</a></li></ul></li></ul></li><li class="tocline"><a href="#acknowledgements" class="tocxref"><span class="secno">A. </span>Acknowledgements</a></li><li class="tocline"><a href="#multiple-types-microdata" class="tocxref"><span class="secno">B. </span>Multiple Item Types in Microdata</a><ul class="toc"><li class="tocline"><a href="#mixing-vocabularies-using-a-type-property" class="tocxref"><span class="secno">B.1 </span>Mixing Vocabularies using a Type Property</a></li><li class="tocline"><a href="#mixing-vocabularies-using-repeated-content" class="tocxref"><span class="secno">B.2 </span>Mixing Vocabularies using Repeated Content</a></li></ul></li><li class="tocline"><a href="#references" class="tocxref"><span class="secno">C. </span>References</a><ul class="toc"><li class="tocline"><a href="#normative-references" class="tocxref"><span class="secno">C.1 </span>Normative references</a></li><li class="tocline"><a href="#informative-references" class="tocxref"><span class="secno">C.2 </span>Informative references</a></li></ul></li></ul></div>
+ </div><div id="sotd" class="introductory section"><h2>Status of This Document</h2><p><em>This section describes the status of this document at the time of its publication. Other documents may supersede this document. A list of current <acronym title="World Wide Web Consortium">W3C</acronym> publications and the latest revision of this technical report can be found in the <a href="http://www.w3.org/TR/"><acronym title="World Wide Web Consortium">W3C</acronym> technical reports index</a> at http://www.w3.org/TR/.</em></p><p>This document was published by the <a href="http://www.w3.org/wiki/Html-data-tf">HTML Data Task Force</a> as a Note. If you wish to make comments regarding this document, please send them to <a href="mailto:public-html-data-tf@w3.org">public-html-data-tf@w3.org</a> (<a href="mailto:public-html-data-tf-request@w3.org?subject=subscribe">subscribe</a>, <a href="http://lists.w3.org/Archives/Public/public-html-data-tf/">archives</a>). All feedback is welcome.</p><p>Publication as a Note does not imply endorsement by the <acronym title="World Wide Web Consortium">W3C</acronym> Membership. This is a draft document and may be updated, replaced or obsoleted by other documents at any time. It is inappropriate to cite this document as other than work in progress.</p><p>This document was produced by a group operating under the <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/">5 February 2004 <acronym title="World Wide Web Consortium">W3C</acronym> Patent Policy</a>. <acronym title="World Wide Web Consortium">W3C</acronym> maintains a <a href="" rel="disclosure">public list of any patent disclosures</a> made in connection with the deliverables of the group; that page also includes instructions for disclosing a patent. An individual who has actual knowledge of a patent which the individual believes contains <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#def-essential">Essential Claim(s)</a> must disclose the information in accordance with <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#sec-Disclosure">section 6 of the <acronym title="World Wide Web Consortium">W3C</acronym> Patent Policy</a>.</p></div><div id="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="#scope" class="tocxref"><span class="secno">1.1 </span>Scope</a></li><li class="tocline"><a href="#terminology" class="tocxref"><span class="secno">1.2 </span>Terminology</a></li></ul></li><li class="tocline"><a href="#publishers" class="tocxref"><span class="secno">2. </span>Publishers</a><ul class="toc"><li class="tocline"><a href="#choosing-a-publishing-format" class="tocxref"><span class="secno">2.1 </span>Choosing a Publishing Format</a><ul class="toc"><li class="tocline"><a href="#syntax-considerations" class="tocxref"><span class="secno">2.1.1 </span>Syntax Considerations</a></li><li class="tocline"><a href="#vocabulary-considerations" class="tocxref"><span class="secno">2.1.2 </span>Vocabulary Considerations</a></li><li class="tocline"><a href="#usability-considerations" class="tocxref"><span class="secno">2.1.3 </span>Usability Considerations</a></li></ul></li><li class="tocline"><a href="#publishing-in-multiple-formats" class="tocxref"><span class="secno">2.2 </span>Publishing in Multiple Formats</a><ul class="toc"><li class="tocline"><a href="#mixing-vocabularies" class="tocxref"><span class="secno">2.2.1 </span>Mixing Vocabularies</a><ul class="toc"><li class="tocline"><a href="#mixing-vocabularies-in-microformats" class="tocxref"><span class="secno">2.2.1.1 </span>Mixing Vocabularies in Microformats</a></li><li class="tocline"><a href="#mixing-vocabularies-in-rdfa" class="tocxref"><span class="secno">2.2.1.2 </span>Mixing Vocabularies in RDFa</a></li><li class="tocline"><a href="#mixing-vocabularies-microdata" class="tocxref"><span class="secno">2.2.1.3 </span>Mixing Vocabularies in Microdata</a></li></ul></li><li class="tocline"><a href="#mixing-syntaxes" class="tocxref"><span class="secno">2.2.2 </span>Mixing Syntaxes</a><ul class="toc"><li class="tocline"><a href="#dates-and-times" class="tocxref"><span class="secno">2.2.2.1 </span>Dates and Times</a></li><li class="tocline"><a href="#link-relations" class="tocxref"><span class="secno">2.2.2.2 </span>Link relations</a></li><li class="tocline"><a href="#microdata-and-rdfa-equivalencies" class="tocxref"><span class="secno">2.2.2.3 </span>Microdata and RDFa Equivalencies</a></li><li class="tocline"><a href="#properties-within-links" class="tocxref"><span class="secno">2.2.2.4 </span>Properties Within Links</a></li><li class="tocline"><a href="#datatypes" class="tocxref"><span class="secno">2.2.2.5 </span>Datatypes</a></li><li class="tocline"><a href="#iris" class="tocxref"><span class="secno">2.2.2.6 </span>IRIs</a></li></ul></li></ul></li><li class="tocline"><a href="#good-publishing-practice" class="tocxref"><span class="secno">2.3 </span>Good Publishing Practice</a><ul class="toc"><li class="tocline"><a href="#valid-html" class="tocxref"><span class="secno">2.3.1 </span>Valid HTML</a></li><li class="tocline"><a href="#context-independence" class="tocxref"><span class="secno">2.3.2 </span>Context Independence</a></li><li class="tocline"><a href="#testing" class="tocxref"><span class="secno">2.3.3 </span>Testing</a></li><li class="tocline"><a href="#clear-licensing" class="tocxref"><span class="secno">2.3.4 </span>Clear Licensing</a></li></ul></li></ul></li><li class="tocline"><a href="#consumers" class="tocxref"><span class="secno">3. </span>Consumers</a><ul class="toc"><li class="tocline"><a href="#choosing-a-syntax-to-consume" class="tocxref"><span class="secno">3.1 </span>Choosing a Syntax to Consume</a><ul class="toc"><li class="tocline"><a href="#application-considerations" class="tocxref"><span class="secno">3.1.1 </span>Application Considerations</a></li><li class="tocline"><a href="#tooling-considerations" class="tocxref"><span class="secno">3.1.2 </span>Tooling Considerations</a><ul class="toc"><li class="tocline"><a href="#microdata-microformats-2-data-model" class="tocxref"><span class="secno">3.1.2.1 </span>Microdata/Microformats-2 Data Model</a></li><li class="tocline"><a href="#rdf-data-model" class="tocxref"><span class="secno">3.1.2.2 </span>RDF Data Model</a></li></ul></li><li class="tocline"><a href="#data-model-considerations" class="tocxref"><span class="secno">3.1.3 </span>Data Model Considerations</a></li><li class="tocline"><a href="#usability-considerations-1" class="tocxref"><span class="secno">3.1.4 </span>Usability Considerations</a></li></ul></li><li class="tocline"><a href="#consuming-multiple-formats" class="tocxref"><span class="secno">3.2 </span>Consuming Pages with Multiple Formats</a></li><li class="tocline"><a href="#good-consumption-practice" class="tocxref"><span class="secno">3.3 </span>Good Consumption Practice</a></li></ul></li><li class="tocline"><a href="#vocabulary-authors" class="tocxref"><span class="secno">4. </span>Vocabulary Authors</a><ul class="toc"><li class="tocline"><a href="#extending-vocabularies" class="tocxref"><span class="secno">4.1 </span>Extending Vocabularies</a><ul class="toc"><li class="tocline"><a href="#extending-microformats" class="tocxref"><span class="secno">4.1.1 </span>Extending Microformats</a></li><li class="tocline"><a href="#extending-rdf-vocabularies" class="tocxref"><span class="secno">4.1.2 </span>Extending RDF Vocabularies</a></li><li class="tocline"><a href="#extending-microdata-vocabularies" class="tocxref"><span class="secno">4.1.3 </span>Extending Microdata Vocabularies</a></li></ul></li><li class="tocline"><a href="#designing-vocabularies" class="tocxref"><span class="secno">4.2 </span>Designing Vocabularies</a><ul class="toc"><li class="tocline"><a href="#syntax-specific-requirements" class="tocxref"><span class="secno">4.2.1 </span>Syntax-Specific Requirements</a><ul class="toc"><li class="tocline"><a href="#microformat-vocabularies" class="tocxref"><span class="secno">4.2.1.1 </span>Microformat Vocabularies</a></li><li class="tocline"><a href="#microdata-vocabularies" class="tocxref"><span class="secno">4.2.1.2 </span>Microdata Vocabularies</a></li><li class="tocline"><a href="#rdfa-vocabularies" class="tocxref"><span class="secno">4.2.1.3 </span>RDFa Vocabularies</a></li></ul></li><li class="tocline"><a href="#syntax-neutral-vocabularies" class="tocxref"><span class="secno">4.2.2 </span>Syntax-Neutral Vocabularies</a></li><li class="tocline"><a href="#good-vocabulary-design-practices" class="tocxref"><span class="secno">4.2.3 </span>Good Vocabulary Design Practices</a></li></ul></li></ul></li><li class="tocline"><a href="#acknowledgements" class="tocxref"><span class="secno">A. </span>Acknowledgements</a></li><li class="tocline"><a href="#multiple-types-microdata" class="tocxref"><span class="secno">B. </span>Multiple Item Types in Microdata</a><ul class="toc"><li class="tocline"><a href="#mixing-vocabularies-using-a-type-property" class="tocxref"><span class="secno">B.1 </span>Mixing Vocabularies using a Type Property</a></li><li class="tocline"><a href="#mixing-vocabularies-using-repeated-content" class="tocxref"><span class="secno">B.2 </span>Mixing Vocabularies using Repeated Content</a></li></ul></li><li class="tocline"><a href="#references" class="tocxref"><span class="secno">C. </span>References</a><ul class="toc"><li class="tocline"><a href="#normative-references" class="tocxref"><span class="secno">C.1 </span>Normative references</a></li><li class="tocline"><a href="#informative-references" class="tocxref"><span class="secno">C.2 </span>Informative references</a></li></ul></li></ul></div>
<div id="introduction" class="section">