Database Server Models for WMS and WFS Geographic Web Services - Geographical Information Systems: Trends and Technologies - page 161

1

Class

2

1

1..*

Constraint

0..*

1..*

0..*

Spatial
operator

Alphanumeric
attribute

Spatial
query

1..*

0..*

1

1..*

0..*

0..*

Spatial
attribute

RL

1..*

RLextA-A

1..*

1..*

1..*

Attribute

Method

0..*

0..*

1..*

1..* 1..* 1 1

1 1

Type

RLintA-M

Parameter

1..*

RLintA-A

Fig. 7. Meta-model formalized in UML.

• A spatial query is composed of one or more spatial operators.
• An operand of a spatial operator is a spatial attribute or a spatial
query.

In the following, we present the classifi cation and the determination of
relevant RL for GetFeatureInfo and GetFeature operations. These operations
will provide relevant attributes from the database schema.