Simple Demo: OBSERVER execution
Last update: June 24, 2003
Query Edition
Retrieve the name, location and room rate for hotels with a room rate equals to $200
[Name Location Price] of (AND hotel (FILLS Price 200))
DL query ==> Mappings
DL query ==> Multi-repository mappings
Multi-repository mappings ==> several mono-repository mappings
Access to data repositories
Mono-repository mappings ==> queries in Local Query Language (LQL)
Execution of LQL queries
Access data using wrappers
Applying transformer functions
Obtaining final answer using an auxiliar database
Presentation of answer to the user
joalroyo@unizar.es
June 11, 2003