Geographical Information Systems

Database Server Models for WMS and WFS Geographic Web Services 157

Relevant Link RLintA-M

A RLintA-M link leads to additional attributes in the fi nal schema, which

are results of methods.

A RLintA-M link binds a set of attributes of a given class (possibly

reduced to a singleton) to a method of the same class. This set of attributes

represents the source attributes and belongs to the initial schema. The

result of the method (here a function) will be added to the fi nal schema as

a new attribute.

This RL is defi ned by the following elements: the class concerned by

this RL (c

i

), the set of source attributes (A

s

), the method (m

k

), its parameter

list ...