ANNOUNCEMENT: DSDs a new schema language supporting XSLT

Subject: ANNOUNCEMENT: DSDs a new schema language supporting XSLT
From: Nils Klarlund <klarlund@xxxxxxxxxxxxxxxx>
Date: 24 Nov 1999 09:56:37 -0500
Document Structure Descriptions are a new way of describing classes of
XML documents (http://www.brics.dk/DSD).  The notation was
specifically designed with XSLT in mind (among other things of
course):
 
   Whenever you write code to typeset a class of XML documents
   described with a weak descriptive notation such as DTDs (or even
   XML Schemas as they look currently), you are faced with the "gap"
   problem: many documents that satisfy the DTD are not really valid
   documents anyway, and thus they slip through the crack (the DTD
   validation) and the XSLT must now be written so as to inform the
   user about the syntactic problems.  Examples abound: nested anchors
   in HTML, no simultaneous "href" and "name" attribute, etc.
  
Instead, we propose a strong descriptive notation whose expressive
power is similar to XSLT.  Thus, syntax description (in DSDs) can be
separated from semantics (in XSLT).

Our announcement is:

------------------------------------------------------------------
A Document Structure Description (DSD) is a new and very effective way
of describing XML documents.  This new schema language is result of a
research collaboration between AT&T Labs, NJ and BRICS at the
University of Aarhus, Denmark.  The DSD language has arisen out of a
need to describe XML documents to Web programmers with an elementary
background in computer science.  DSDs have also been expressively
designed to further W3C sponsored XML technologies such as Cascading
Style Sheets (CSS) and XSL Transformations (XSLT).

CSS is an essential part of modern HTML, but has so far not been
formulated as a general style sheet mechanism for XML that works with
any semantic domain.  DSDs provide both a generalized semantics for a
CSS-like style sheet mechanism and document processing instructions
that provide the abstraction benefits of CSS in any XML document.

XSLT 1.0 is a programming notation that allows transformations of
classes of XML documents into semantic domains like HTML.  XSLT
programs are easy to write, especially if assumptions can be made
about the input documents.  The expressive power of DSDs allow
declarative and readable specifications of XML documents that are to
be subjected to XSLT processing.

DSDs require no specialized XML/SGML insights.  The technology is
based on general and familiar concepts that allow much stronger
document descriptions than possible with DTDs or the current XML
Schema proposal.  

For more information, please go to the DSD Web site:

  http://www.brics.dk/DSD

We already offer

- a detailed, complete, and tested DSD 1.0 language description

- an introductory article

- free source code

- a meta-DSD that completely accounts for the syntax of DSDs

- an XSLT pretty-printer that converts DSDs into hyper-link HTML

- a preliminary industrial case report, where we discuss the use of
  DSD to describe XPML, a variation on HTML for interactive voice
  services


We are encouraging comments and suggestions for further development!


Nils Klarlund, AT&T Research
Anders Møller, BRICS
Michael I. Schwartzbach, BRICS






 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list


Current Thread