Grammar rule 52 is using single quote notation, and I believe this is just a typo when submitting the original change.

However DMNv1.3 also missed to exclude grammar 52 from defining Literal terminal symbol.
This is a concerning problem.
This implies rule 52 as defined in DMNv1.3 is defining additional Literal terminal symbol(s) and therefore with DMNv1.3 it is no longer formally possible to name a DRGElement for example: "list of products" or "context of business".
I believe this is an oversight in backward compatibility:

• rule 52 is only used for the technical “instance of” operator which may find limited use by business analysts
• using as a name “list …” or “context …” might be more relevant and wide-spread used, ref examples above

The proposal below addresses this problem as well, making DMNv1.3+ backward compatible again

Proposal

A total of 2 changes.

With reference to DMNv1.3 dtc-19-12-06

Chapter 10.3.1.2 Grammar rules Page 121
replace:

52. type =
qualified name |
'list' '<' type '>' |
'context' '<' name ':' type { ',' name ':' type } '>' | 'function' '<' [ type { ', ' type } ] '>' '->' type
;

with:

52. type =
qualified name |
"list" "<" type ">" |
"context" "<" name ":" type { "," name ":" type } ">" | "function" "<" [ type { ", " type } ] ">" "->" type
;

Chapter 10.3.1.4 Tokens, Names, and White space Page 122
before bullet point:

* A sequence conforming to grammar rule 28, 29, 35, or 37

insert new bullet point:

* for backward compatibility reasons, “list” and “context” from grammar rule 52 are not considered Literal terminal symbols.

Correct FEEL grammar rule 52

Replace inverted commas in rule 52 and include "52" in reference