PowerPoint-Pr

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http//www.elena-project.org
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SQI vs. Wrapper

• SQI
• main concern is the communication pattern
• Wrapper
• main concern is the heterogeneity of data
  definition and query languages, and schemas
• We need both!

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Architecture
Target System
Wrapper
SQI
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Implementation

• SQI
• Already implemented by Infonova (first prototype)
  with empty classes
• Needs to be implemented only once
• Wrapper
• Specific for any particular system
• Development usually complex task, but there is a
  lot of similarity among systems!

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Discussion - SQI

• Goal not to require to reimplement
  SessionManagement, from partners who want to
  connect their systems to SQI network, but provide
  a packet, which can be customized
• There are many similarities among different SQI
  implementations
• Identify them!
• Examples
• Separation communication management and wrapping
• Analogous session management
• Analogous handling of queries

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Discussion - Wrapper

• Data definition language
• E.g. SQL, XML, RDF, (Attrib,Value) list
• Elena RDF
• Query language (strongly related to DDL!)
• Simple keywords, SQL, XQuery, QEL,
• Elena QEL
• Schema
• LOM, Elena Common Schema,
• Elena Elena Common Schema