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This proposal is just that, a proposal. So, contributors are very welcome. If you think that any of the ideas or assertions presented in this draft is are incorrect, do not hesitate to share your own view by commenting on the page or contacting the author. The The principal intention of sharing these ideas is to find synergies and common agreement joint agreements on the best possible next steps for the data modelling modeling group. |
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This page describes the proposal to restructure the data
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modeling activities within COVESA. First, the current state is presented to provide the necessary context. Then, the proposal is introduced.
Current setup: no clear
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distinction between conceptual and application areas
So far, the data
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modeling activities in COVESA have been
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primarily centered on the continuous development and maintenance of
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the Vehicle Signal Specification (VSS)
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and the tools that parse VSS into different formats. In the current setup, there is no clear description
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of what requirements (i.e., functional and non-functional) are driving the design of the data model. It seems that the
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primary purpose of VSS is to serve as a naming convention for the properties of the vehicle. Nevertheless, there is little attention given to the separation of concerns:
- On the one hand, there is
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- the "conceptual area,"
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- where the controlled vocabulary has to be described and
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- adequately documented. Data models belong to this area because they
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- define the entities of interest in a particular domain and the possible relationships
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- between
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- them.
- On the other hand, we have
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- the "application area,"
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- where a data model is used in specific implementations (e.g., databases, applications, etc.).
The figure above shows how VSS modeling belongs to the conceptual area. To use the specification described in VSS (i.e., a "vspec" file), one has to parse it into a specific format (e.g., JSON) by using the VSS tools. The tools are the mechanism that makes the VSS data model usable in the application area. From the practical point of view, the application area needs a specific schema that determines the structure in which the data is to be stored. In this context, we mean either long-term storage (e.g., a database) or short-term storage (RAM memory and variables' allocation during application execution).
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