[YANGTOOLS-1339] Enforce YANG 1/1.1 interoperability constraints Created: 30/Sep/21  Updated: 05/Oct/21  Resolved: 05/Oct/21

Status: Resolved
Project: yangtools
Component/s: parser
Affects Version/s: None
Fix Version/s: 8.0.0

Type: Improvement Priority: Medium
Reporter: Robert Varga Assignee: Robert Varga
Resolution: Done Votes: 0
Labels: pt
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified


 Description   

RFC7950 specifies requirements for interoperability between RFC6020 and RFC7950 models:

   A YANG version 1.1 module MUST NOT include a YANG version 1
   submodule, and a YANG version 1 module MUST NOT include a YANG
   version 1.1 submodule.

   A YANG version 1 module or submodule MUST NOT import a YANG
   version 1.1 module by revision.

   A YANG version 1.1 module or submodule MAY import a YANG version 1
   module by revision.

Add the corresponding checks and test suite so we enforce MUST NOTs as appropriate.
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