RFC 0021: Sheet row syntax

[jrentlez]

This RFC removes some unnecessary definitions of RFC 0020 regarding sheet row access.

Feedback is welcome, especially on the alternatives section.

[jrentlez]

@georg-schwarz As discussed, I've changed the RFC to keep the SheetRow value-type.

[georg-schwarz]

Thanks @jrentlez

Did you have time to look into Langium's class member scoping guide? Could this be an alternative to introducing an operator?

[jrentlez]

Did you have time to look into Langium's class member scoping guide? Could this be an alternative to introducing an operator?

I think we would run into the familiar problem that we cannot access sheet columns with wierd names.

IMHO, if we plan to introduce class member scoping, we should first experiment with NestedPropertyAccess from expressions.langium instead of replacing this operator.

[georg-schwarz]

I'm happy to proceed. Don't forget to update the metadata table in the RFC :)