4.4.1. Knowledge Representation
A network of criteria and indicators, as shown in Figure 4.11, represents the knowledge of SFM. The knowledge was broken down into nodes. Each
node represents a concept of sustainability at a particular level. For instance, in Table 4.22 the first principle of generic knowledge is “ecosystem integrity is
maintained”, and the second level derived into criteria - the criteria are followed by their indicators. A verifier or sub-verifier is needed when its super ordinate
cannot represent a single measurement.
Figure 4.11. Network of nodes that represent criteria and indicators Each node has attributes such as detail explanation, who created it, when it was
created etc. Each node has a series of argumentation processes showing whether a particular node is supported or countered in the network, as shown in
Figure 4.12. The argumentation process of each node is stored in its life history SFM
Principles
Criteria
Indicators
Verifier
Sub-verifier
that can be tracked by the user. The importance of that history is to enable the user to learn how the knowledge exists in the network.
Table 4.22. The hierarchy of nodes
Principle 1 Ecosystem integrity is maintained
Criterion 1.1 Biodiversity is maintained Landscape pattern is maintained
The species richness of selected groups is maintained Population sizes of selected species do not show significant change
Rare or endangered species are protected ……………….
Indicators
Verifier Sub-verifier ……………….
Figure 4.12. The argumentation process The relation between nodes under one super ordinate is not necessary all
ANDs. It might be AND or OR as illustrated in Figure 4.13. N1 has five subordinates. The AND relation connects the first three nodes, and the OR
relation relates the fourth and fifth nodes. Thus, N1 comprises three nodes N.1.1, N.1.2 and N.1.3 and one node either N.1.4 or N.1.5.
A1. argument to support N1 N1 is live
A2. argument to counter A1 N1 is dead
A3. argument to counter A2 N1 is live
A4. argument to counter A3 N1 is dead
N1
Figure 4.13. The relation between nodes
4.4.2. Reasoning Engine
Kategori