The ObjectScript language of InterSystems IRIS has a very powerful metadata engine called XData. This feature allows the creation of metadata definitions for your classes, to be used by the compiler or by programs that will extend the standard features of the language, based on the XData definitions of its scope.
An example is IRIS Publisher, an Open Source application from the community capable of collecting all XData definitions in HTML and / or Markdown format and generating a Web Portal with all the application documentation assembled from these XData elements.
See the whole process here:

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