[bern4444]

It is not infinitely recursive. It supports nested structures as you show but only up to a predefined depth.

IE:

    fragment CategoriesRecursive on Category {
      subcategories {
        ...SubcategoryFields
        subcategories {
          ...SubcategoryFields
          subcategories {
            ...SubcategoryFields
          }
        }
      }
    }

So you have to build your schema with a maximum supported depth. This is not infinitely recursive which is a limitation of the GQL type system.