ZedAI Roles

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Contents

Roles and RDF Taxonomy Workspace

This page summarizes current work on DAISY4 Roles. For a broader overview, please go to the Vocabularies page.

Goals

Broad goals:

  1. Enable mainstream software to understand DAISY-namespace elements
  2. Enable DAISY software to understand elements from namespaces outside the DAISY specification

In order to facilitate this communication, a taxonomy is required. Its purposes are:

  1. to define fundamental relationships of DAISY constructs to others' constructs.
  2. to be a point of reference for profile/module creators or even other specifications when introducing and describing new constructs.
  3. to provide role attribute values for use by distribution profiles of DAISY.

Current Status

For Iteration 1, the DAISY vocabulary will be expressed in RDF in order to create a DAISY taxonomy which defines objects from the new Simple/Leisure and Periodicals DAISY profiles.

Go to the draft page for this work.

Reports

The Iteration 0 report is available. It analyzes uses for RDF/role in DAISY4 (aka ZedNext).

Background Information

Here is a good introduction to semantic web languages, including RDF, OWL, GRDDL, and RDFa.


RDF

RDF is an information modeling language.

It expresses metainformation in the form of subject + predicate + object. Such a combination is called a "triple".

Example: The sky + has the color + blue.

http://www.w3.org/RDF/


OWL

OWL is a Web Ontology Language. Tools can reason about ontologies constructed using OWL because it offers some degree of computational certainty.

http://www.w3.org/TR/owl-ref/

RDF Schema

Also called RDFs. It contains basic elements with which to construct an ontology.

http://www.w3.org/TR/rdf-schema/

RDFa

RDFa = XHTML + RDF Most usefully seen as XHTML with inline RDF. 

 <p xmlns:dc="http://purl.org/dc/elements/1.1/"
   about="http://www.example.com/books/wikinomics">
  In his latest book
  <cite property="dc:title">Wikinomics</cite>,
  <span property="dc:creator">Don Tapscott</span>
  explains deep changes in technology,
  demographics and business.
  The book is due to be published in
  <span property="dc:date" content="2006-10-01">October 2006</span>.
 </p>

the specification

an introduction

GRDDL

Transformation to express non-rdf data in rdf/xml.

http://www.w3.org/TR/grddl/

XHTML2 Role Attribute Module

The role attribute is a mechanism in XHTML for linking data to semantic properties defined in RDF.

http://www.w3.org/TR/xhtml2/mod-roleAttribute.html

WAI-ARIA

WAI-ARIA defines a way to make Web content and Web applications more accessible to people with disabilities. It provides a framework for adding attributes to identify features for user interaction, how they relate to each other, and their current state. The specification provides an ontology of roles, states, and properties that set out an abstract model for accessible interfaces and can be used to improve the accessibility and interoperability of Web Content and Applications.

Notes/Scratchpad

From call on 10/2:

  • Need to be explicit about distinction between (a) goal of mapping DAISY vocabulary onto XHTML so that generic XHTML user-agents can render DAISY markup, and/or (b) mapping arbitrary 3rd party XML vocabularies (eg, NewsML) onto DAISY so that DAISY user agents can render NewsML or other general XML files.
  • Some types of roles we may want to handle (using <pagenum> as example):
    • behavior roles (navigational element; can-skip)
    • structural roles (inline element; point or range semantics)
    • content roles (has a label, has a target (anchor) location in file)
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