Simple Demo: OBSERVER execution

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

Result of LQL for dbHotels Repository

ALIAS

Result before aplying transformed functions

AUX-1

name	location	meals	building	facilities	units	price	stars
Mercure	Berlin, Germany	null	collective	Conference Rooms	100	168	4
IBIS	Postdam, Germany	null	collective	null	50	65	2
Meier	Berlin, Germany	null	collective	Conference Rooms	50	55	2
Schulz	Postdam, Germany	null	private	null	1	60	2

AUX-4

Name	Location
Mercure	Berlin, Germany
IBIS	Postdam, Germany
Meier	Berlin, Germany
Schulz	Postdam, Germany

AUX-7

Name
Mercure
IBIS
Meier
Schulz

AUX-10

name	location	meals	building	facilities	units	price	stars
Mercure	Berlin, Germany	null	collective	Conference Rooms	100	168	4
IBIS	Postdam, Germany	null	collective	null	50	65	2
Meier	Berlin, Germany	null	collective	Conference Rooms	50	55	2
Schulz	Postdam, Germany	null	private	null	1	60	2

AUX-13

name	location	meals	building	facilities	units	price	stars
Mercure	Berlin, Germany	null	collective	Conference Rooms	100	168	4
IBIS	Postdam, Germany	null	collective	null	50	65	2
Meier	Berlin, Germany	null	collective	Conference Rooms	50	55	2
Schulz	Postdam, Germany	null	private	null	1	60	2

Result of LQL for XMLHotels Repository

ALIAS

Result before aplying transformed functions

AUX-2

name	location	meals	building	facilities	units	price	stars
Ritz	London, England	null	collective	Conference Rooms	500	120	5

AUX-5

name	location	meals	building	facilities	units	price	stars
Ritz	London, England	null	collective	Conference Rooms	500	120	5

AUX-8

name	location	meals	building	facilities	units	price	stars
Ritz	London, England	null	collective	Conference Rooms	500	120	5

AUX-11

name	location	meals	building	facilities	units	price	stars
Ritz	London, England	null	collective	Conference Rooms	500	120	5

AUX-14

name	location	meals	building	facilities	units	price	stars
Ritz	London, England	null	collective	Conference Rooms	500	120	5

Result of LQL for WebSearchHotels Repository

ALIAS

Result before aplying transformed functions

AUX-3

name	location	meals	building	facilities	units	price	stars
Radisson	Copenhagen, Denmark	null	collective	Conference Rooms	150	580	3

AUX-6

name	location	meals	building	facilities	units	price	stars
Radisson	Copenhagen, Denmark	null	collective	Conference Rooms	150	580	3

AUX-9

name	location	meals	building	facilities	units	price	stars
Radisson	Copenhagen, Denmark	null	collective	Conference Rooms	150	580	3

AUX-12

name	location	meals	building	facilities	units	price	stars
Radisson	Copenhagen, Denmark	null	collective	Conference Rooms	150	580	3

AUX-15

name	location	meals	building	facilities	units	price	stars
Radisson	Copenhagen, Denmark	null	collective	Conference Rooms	150	580	3

Applying transformer functions

Obtaining final answer using an auxiliar database

Presentation of answer to the user