Data Requirements

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Data Quality Rule Definition Example DQ-Constraint
Mandatory Property and Literal Rules Properties and their literals become

mandatory, if the data is required for the task at hand.

The properties indicating the

geographical coordinates must exist and have values for all instances of the class foo:Location to be able to navigate to each location.

Syntactic Rules Syntactic rules define the type of

characters and/or the pattern of literal values.

Literal values for the property

foo:country-name must only contain letters.

Functional Dependency Rules Functional dependencies are

dependencies between the values of two or more different properties.

The literal value for foo:city is

always dependent to the literal value for foo:country, since certain city names only exist in certain countries.

Legal Value Rules Legal value rules are the explicit

definition of the allowed values for a certain property.

The property foo:gender must only

contain the values “male”, “female”, “m”, or “f”.

Legal Value Range Rules Legal value range rules are the explicit

definition of the allowed value range for properties holding numerical values. A value range contains an upper and/or lower limit.

The property foo:population

must only contain values greater than zero.

Illegal Value Rules Illegal value rules are the explicit

definition of the values that may not be assigned to a certain property.

The property foo:gender may never

contain the value “mail”.

Illegal Value Range Rules Illegal value range rules are the explicit

definition of prohibited value ranges for properties holding numerical values. A value range contains an upper and/or lower limit.

The property foo:population

must not contain values less than one.

Unique Value Rules Unique value rules define properties that

may contain each literal value not more than once within a defined collection of values.

Each value for property foo:ISBN in

instances of class foo:Book may not occur more than once.

Outdated Value Rules Outdated value rules are rules that

identify instances that represent an outdated state of the corresponding real world entity.

Instances of the class foo:Offer are

outdated, if its value for foo:validThrough is elder than the current date and time.

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