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To compare the systems we use a number of "challenge problems".
A challenge problem can be given by one specific model that is encoded in a particular representation language
(the "reference model").
Usually, these are model examples that come with the system implementing the language.
The challenge for other languages/systems is to find an equivalent representation.
Alternatively, a challenge can be formulated as a modeling task in general terms.
The challenge problems are selected to be rather simple examples for fundamental modeling tasks.
Models marked "Leuven exercise" are contributed by Bruynooghe et (many!) al. from Leuven University. See the ILP 2009 paper "An Exercise with Statistical Relational Learning Systems".
 Bloodtype model: A simple genetic model for the inheritance of bloodtypes in a pedigree. Input domains consist of pedigrees with individuals and "father" and "mother" relation. The reference model comes from Balios.
 University model: A model for the adviser relation between students and professors. Input domainsa consist of a number of students and professors. This model is representative for undirected models given by featureinduced potentials, rather than conditional probabilities. The reference model comes from Alchemy.
 HMM model: A standard HMM model. Input domains just consist of the number of time slices over which the model is to be developed (this need no neccessarily be explicitly specified as an extensional model part). We use several variants of an HMM model that differ in the number of states of the hidden variable, and investigate how this affects the representability of this model in languages that only permit binary variables (Primula and Alchemy).
 Noisyor model: A very basic model that uses the noisyor function for combining sereral causal inputs. Input structures are directed acyclic graphs on which a random unary attribute is propagated from the roots downward. Reference model comes from Primula.
 ERmodel (Leuven Exercise):
An entityrelationship model in a realestate agent/customer domain.
 Markov Models (Leuven Exercise):
Different versions of a (hidden) Markov model.

