Is rml:reference = rml:iterator?

[tirrolo]

Looking at the examples, it looks like they are the same thing. Then, we should use the same name.

[elsdvlee]

This is in my opinion also valid voor rml:reference in rml-core. I prefer rml:reference as long as this is term is also used in the expression map defined in rml-core.
@tirrolo do you see a difference with the use of rml:reference in rml-core?

[elsdvlee]

Additionally, for mixed content we need a reference and an iterator, e.g. when switching from json to csv.