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Here, you will find the concepts, that we have defined to represent meanings, that are helpful to make queries to databases of things expressed in terms of those meanings. The way how this place works, is a bit similar to how WikiData works. We store concept definitions and concept aliases in various languages, and also references to formats, in which these concepts are expressed.
The wiki is primarily written in MarkDown and pieces of YAML embedded within it, that enable to define types and instances.