Your SlideShare is downloading. ×

GRDDL: A Pictorial Approach

686

Published on

Published in: Technology, Education
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
686
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
3
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. GRDDL: A Pictorial Approach Chimezie Ogbuji Cleveland Clinic Foundation
  • 2. Abstract vs Concrete Syntax John McCarthy's definition (May 1996) Towards a Mathematical Science of Computation Common way to define concrete syntaxes: EBNF grammar Concrete (synthetic) syntaxes are not well suited for translation between expressive languages Examples: XML, RDF/XML, SPARQL, ..
  • 3. Abstract vs Concrete Syntax: Continued Abstract syntax .. Independent of a particular notation Define the operational semantics of a language Examples: XML Infoset, XPath Data Model, RDF Abstract Syntax, SPARQL Algebra, etc..
  • 4. Arithmetic Example There are various ways to represent the addition operator syntactically Infix: 2 + 2 Postfix: + 2 2 Regardless of the syntax it amounts to the same operation Mathematicians / logicians / programmers can pick a syntax that suites them best
  • 5. RDF Concrete Syntaxes: The Landscape There are many RDF concrete syntaxes and only two are currently W3C-ratified Some are more expressive than others (Notation 3 vs RDF/XML) Others live within a host language (RDFa and eRDF) They all map to the same abstract syntax
  • 6. What Does This Have to Do with GRDDL? Authors who wish to express RDF should not have to wrestle with syntax and vocabulary Typically an author needs to know: RDF abstract syntax (simple) The specifics of a particular concrete syntax (large variance: ntriples / RDF/XML) The specifics of vocabulary (even larger variance: DOLCE vs. RSS)
  • 7. What Does This Have to Do with GRDDL?: Cont. Author only needs to know: An XML vocabulary 'Vanilla' XML XML with resolvable namespace documents XHTML (with GRDDL profile) XHTML (with other GRDDL-enhanced profiles) A mapping to RDF abstract syntax (optional) XSLT 1.0 (built-in transformation language) XProc, XQuery, etc..
  • 8. Draino for Semantic Web Plumbing
  • 9. GRDDL: Points of Contention Which XML pipeline languages are supported natively? What comes out of the pipeline? Localized transformation How do we resolve relative URIs in the result? What about validation and inclusion? Base rule (what to do with RDF/XML?)

×