PS:

On 7 Jun., 22:18, Simon King <[email protected]> wrote:
> As for element constructor, in my minimal example I just provide a
> class as an attribute called "Element" to the parent class. Then, an
> element constructor is correctly inferred (that's one reason to
> initialise the category of the parent):

To avoid misunderstanding: I did not intend to imply that the element
constructor *has* to be provided in that way. You could as well
implement your own _element_constructor_, and it should work.

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