CCD Metamodel

A CCD represents the conceptualisation of a policy case. To ensure well-defined and structured CCD models of a policy domain, the CCD metamodel serves as a blueprint or vocabulary for describing a policy case.
Formally, a metamodel can be defined as a conceptual description of a modelling, which illustrates the model concepts as well as their usage [2]. Thereby the CCD metamodel defines a “set of representational primitives with which to model a domain of knowledge or discourse” as typically an ontology does [1]. Representational primitives of an ontology are typically “classes (or sets), attributes (or properties), and relationships (or relations among class members)” [1]. Based on the approach for ontology of [1] and the rationale of metamodels according to [2], a set of elements of the CCD metamodel are defined. The core elements for the CCD metamodel are derived from insights into the three policy cases in OCOPOMO as well as from discussions with policy modellers in the project. The following (static) elements have been defined for the CCD metamodel:

Concept s with Actor s, Object s (representing particular entities or sets), Attribute s and Relation s. Facts[+] for the simulation model are encoded with Instance s of a concept Actor or Object . Dynamic aspects are encoded as Action . Each concrete Action has an actor, inputs and outputs ( ActionInputOutput ). This allows to model behaviour and interaction in one model. All elements can be linked with each other.

In addition to the core elements of the CCD metamodel, the class Annotation links a concept or concrete instance of the CCD with its basic information in a scenario or background document.
Two types of annotations are possible: text annotations (plain text, html or pdf) and expert annotations. An annotation contains a URL to the document referenced. The annotation is directly stored in the CCD.



[1] T. Gruber. Ontology. In L. Liu and M. T. Özsu, editors, Encyclopedia of Database Systems. Springer-
Verlag, 2009.
[2] A. Winter. Referenz-Meta-schema für visuelle Modellierungssprachen. Deutscher Universitäts-Verlag,
Oktober 2000.



See Scherer, Sabrina; Wimmer, Maria A. (2011): Consistent Conceptual Descriptions to Support Formal Policy Model Development: Metamodel and Approach. In: Wyner, Adam; Benn, Neil: Proceedings of the Workshop on Modelling Policy-making (MPM 2011) in conjunction with The 24th International Conference on Legal Knowledge and Information Systems (JURIX 2011). S. 23-28.

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