Manchester mtg

MyGrid

• Ontology
   
  • Describe services
     
  • Cross-taxonomy links
     
  • Resource discovery
     
  • Personal area
     
    • Annotated data
       

People

• Sean
   
  • Technologies
     
• Robert
   
  • Manage large ontologies
     
• Anita
   
• Elizabeth
   

CDS

• UCDs
   

Man Presentation

» See document: Man Presentation.mmp

Ontologies

• Merging
  using a richer model - explicit descriptions of terms - makes them more amenable to work together
  
   
  • Problematic
     
    • Simple combination
      'exploding bicycle' type of accidents
      
       
  • Machine assistance
     
• Levelling
   
  • Depth
     
  • Computation
     
• Tips
   
  • 1. Create taxonomy by hand
     
  • 2. Add properties
     
    • Reasoner rearranges things
       
• Errors
  how to handle uncertain definitions
  
   
  • Naming continua regions
     
  • Definitions
    only use textual ones at the moment
    
     
    • Level
      more difficult the higher up the tree
      
       
  • Combine reasoning
    over both description and concrete data
    
     

Modelling

• Tractable
  avoid problems with complexity that cannot be easily reasoned over

  
  
  

  
   
• Problems
  particular constructs cause problems
  
   
  • Too many ORs
     

Namespaces

need to differentiate syntactic separation from ontological separation

• Syntactic mechanism
   
• Daml, rdf, rdfs
   
  • Language
     
• Ontology itself
   
• Import
  part of daml+oil
  
   

Relationship direction

1. planet => partof solarsystem

2. solarsystem => haspart planet

telling different things

could say partof is inverse of haspart

but 1 & 2 still mean diff things

inference engine can return facts(!)

• Planet part-of solar_system
   
• Solar_system has planet
   

Storage

• Xml database
   
  • Rdf problems
     
    • Round tripping
       
  • No ordering
     

Projects

• TAMBIS
  built using older technology

  looking at rebuilding using newer tech

  
   
  • Drive queries
     
  • Lots of resources
     
    • Diff access methods
       
  • Built model
     
  • Model used as access method
     
  • Query GUI
    each successive form built using existing knowledge
    
     
    • Add relationships
       
    • Refine choices
       
    • Written into preprocessor language
       
    • Executed
       
  • System constraints
     
    • GRAEL
      everything modelled in same place
      
       
• COHSE
   
  • Hypertext linking
     
  • Use ontology
     
• Geodise
   
  • Annotate logs
     
• MyGrid
  Carole re workflow
  
   
  • DAML-S
    daml services: paper from Robert
    
     

Tools

• Jena
   
  • Used for parsing
     
  • Now has daml+oil api
     
• OilEd
  
   
  • Source available
     
    • Java
       
  • Recoding
     
• Component library
  part of: OilEd
   
  • Parsers
     
  • Into data structures
     
• Ontology service
  potato/os/OntologyService
  
   
  • Cgi gateway
     
  • Used in myGrid
     
  • Wrap as soap
    being done now
    
     

Workflow

• Organizational memory
   

Languages

based on description logic approaches

• OWL
   
• Relationships
  use Properties
  
   

Please send your comments to Tony Linde. This document was updated 15-Aug-2002.