|  | 1 | [[TracNav]] | 
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                          |  | 3 | = SimPack = | 
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                          |  | 5 | The SimPack project provides a number of measures on different data models. It is published by the IFI (Institut für Informatik) of Zürich, Switzerland. The original project site can be found here: | 
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                          |  | 7 | [http://www.ifi.unizh.ch/ddis/simpack.html http://www.ifi.unizh.ch/ddis/simpack.html] | 
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                          |  | 11 | == Accessors == | 
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                          |  | 13 | The SimPack data model differs from the ontology based model of the PhaseLibs in the following way: A SimPack measure instance can only measure the distance of two single entities. A certain aspect of these entities is then accessed by providing appropriate Accessor instances upon initialisation. Thus, a SimPack measure cannot be reused for other entities nor other aspects of the same entities -  a new measure would have to be instantiated. | 
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                          |  | 16 | There are 4 different types of accessors: | 
                          |  | 17 | 1. strings or sequences of strings | 
                          |  | 18 | 2. feature vectors | 
                          |  | 19 | 3. graphs | 
                          |  | 20 | 4. information theory based | 
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