Module 2

The structured object data type and storing and retrieving facts


The previous Module introduced some of Prolog's data types and the important concept of unification. This Module introduces another data type, the structured object. Using this, it is possible to write simple and useful Prolog programs.

The Prolog structured object
About the use of a Prolog data structure that allows the description of relationships between pieces of information.

Diagramming structured objects
How Prolog structured objects can be drawn as trees. this makes it easy to understand their structure.

Querying structured objects
Diagrams of queries can be made in the same way as diagrams of Prolog's structured objects. The reason for this is simple: Prolog uses the same data structure for both.

Queries with more than one goal and the anonymous variable
How queries can be comprised on more than one goal. This is important because the bodies of Prolog rules usually consist of collections of more than one Prolog goal. In other words, you are well on the way to writing Prolog rules. This part also shows the use of the Anonymous Variable.


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These Pages are maintained by Dr Peter Hancox

Last updated October 1998