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A conceptual model of a virtual world is a high-level representation of how the objects behave and how they are
related to each other. The conceptual models identify the most essential elements of the reality to be simulated. This
is the first and a very important step in the process of designing a virtual world. Afterwards, specific and complex
models can be implemented and inserted into these conceptual models. This paper provides an overview of existing
conceptual models used to design virtual worlds. A number of existing frameworks and architecture for describing
virtual worlds are classified into six kinds of conceptual models: unstructured, graphic-oriented, network-oriented,
object-oriented, environment-oriented and relational graph-oriented representations. The advantages and issues
regarding virtual world design, management, reusability and interoperability are discussed
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