XML and Databases Exercise Session 3 (courtesy of Ghislain Fourny/ETH)
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Transcript of XML and Databases Exercise Session 3 (courtesy of Ghislain Fourny/ETH)
XML and DatabasesExercise Session 3
(courtesy of Ghislain Fourny/ETH)
Department of Computer Science
Good to know: XML Schema types
Simple type - predefined or user-defined - element or attribute type
Complex type - user-defined - element type only
Empty content Simple content Complex content Mixed content
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Department of Computer Science
Good to know: XML Schema types
Types (can) have QNames: All predefined types
User-defined types (here simple)
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Tags, attributes... XML Schema looks like XML... that's because it is XML!
Tags, attributes... XML Schema looks like XML... that's because it is XML!
Department of Computer Science
Good to know: XML Schema types
They can also be anonymous.
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Anonymous types can be defined under any xs:element or xs:attribute. Non-anonymous types have a global scope and must be defined directly under xs:schema.
Anonymous types can be defined under any xs:element or xs:attribute. Non-anonymous types have a global scope and must be defined directly under xs:schema.
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Complex types in XML Schema
Complex type, complex content
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Complex types in XML Schema
Simple content (here anonymous)
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Complex types in XML Schema
Empty content Simple content restricted to "" Or a complex content without any children
Mixed content As in complex content, with an additional attribute
mixed set to true in xs:complexType
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Exercises 1-3
Passenger
Flight
Airport
Booking
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Exercises 1-3
Passenger: name, address, passport number
Flight: ID, number of seats, date, origin, dest
Airport: name, code, tax value
Booking: credit card, flight, passenger
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Exercise 1: XML Data
Sample data
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Exercise 1: XML Data
How to prevent this?
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Exercise 1: XML Data
How to prevent this?
With a DTD/Schema!
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Exercise 2: XML Schema Modelling
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Exercise 2: XML Schema Modelling
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Passport number name address
Passenger
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Exercise 2: XML Schema Modelling
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code name tax
Passport number name address
Airport
Passenger
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Exercise 2: XML Schema Modelling
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code name tax flightID seatNo date
Passport number name address
Airport Flight
Passenger
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Exercise 2: XML Schema Modelling
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code name tax flightID seatNo date
Passport number name address
Airport Flight
Passenger
source
dest
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Exercise 2: XML Schema Modelling
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code name tax flightID seatNo date
credit card
Passport number name address
Airport Flight
Passenger
source
dest
book
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Exercise 2: XML Schema Modelling
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code name tax flightID seatNo date
credit card
Passport number name address
Airport Flight
Passenger
source
dest
book
1
1
N
N
N
M
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Exercise 2: What‘s wrong?
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Exercise 2: Inconsistency
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Exercise 2: Inconsistency
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Exercise 2: Redundancy
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Exercise 2: Redundancy
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Exercise 2: Extraneous data
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Exercise 2: A Schema for Passenger
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Passport number name address
Passenger
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Exercise 2: A Schema for Passenger
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Passport number name address
Passenger
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Exercise 2: A Schema for Flight
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flightID seatNo date
Airport Flight
source
dest
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Exercise 2: A Schema for Flight
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flightID seatNo date
Airport Flight
source
dest
Department of Computer Science
Exercise 2: A Schema for Flight
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flightID seatNo date
Airport Flight
source
dest
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Exercise 2: A Schema for Flight
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flightID seatNo date
Airport Flight
source
dest
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Exercise 2: A Schema for Airport
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code name tax
Airport
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Exercise 2: A Schema for Airport
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code name tax
Airport
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Exercise 2: A Schema for Airport
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code name tax
Airport
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Exercise 2: Root Element
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Exercise 3: DTD and XML Schema
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Exercise 3: Corresponding XML Schema
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Exercise 4: Corresponding XML Schema
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Exercise 3: Corresponding XML Schema
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Department of Computer Science
Exercise 3: Corresponding XML Schema
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Department of Computer Science
Exercise 3: Corresponding XML Schema
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Department of Computer Science 42
Hope to see you next week!Hope to see you next week!