- 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)
| LQL for dbHotels Repository
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| ALIAS | LQL Tree
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| AUX-1
| 
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| AUX-4
| 
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| AUX-7
| 
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| AUX-10
| 
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| AUX-13
| 
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| LQL for XMLHotels Repository
|
| ALIAS | LQL Tree
|
| AUX-2
| 
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| AUX-5
| 
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| AUX-8
| 
|
| AUX-11
| 
|
| AUX-14
| 
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| LQL for WebSearchHotels Repository
|
| ALIAS | LQL Tree
|
| AUX-3
| 
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| AUX-6
| 
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| AUX-9
| 
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| AUX-12
| 
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| AUX-15
| 
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- Execution of LQL queries
- Obtaining final answer using an auxiliar database
- Presentation of answer to the user
