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There are numerous examples and explanations between the documentation, examples which install with the product and on OTN (http://www.oracle.com/technetwork/apps-tech/policy-automation/documentation/index.html). A couple of good starting points are the following topics in the OPM User's Guide (10.4.2): "Define a data model", "Define a relationship" and "Write rules that infer relationships and entities" - it is important to understand the different components of a policy model (also covered in the Oracle University courses on Oracle Policy Modeling).
To quickly answer a few of your questions:
- Attributes are associated with an entity not a relationship. Relationships are defined as being between two entities.
- Inferred relationships can be between any two entities - the entities do not need to be the same.
- Inferred relationships are used so that relationships can be "inferred" by rules - i.e. if rules dictate when two entities should be related then inferred relationships are necessary.
For example, determining if a person is considered a member of a household or if a product should be recommended to a person or determining the legal dependents of a person, or determining the preferred replacement products to offer under warranty replacement policies. In other words, there are countless uses and needs for inferred relationships.