Improper length requirement on root^extension

[JohnMoehrke]

https://github.com/usnistgov/iheos-toolkit2/blob/61b612a7378e1df32f8685ac13f1a14b1bf69002/validators-registry-metadata/src/main/java/gov/nist/toolkit/valregmetadata/validators/RegistryObjectValidator.java#L116C1-L116C1

I don't think that this 15 character limit is legitimate. Where did this requirement come from? Even elsewhere where CXi is used IHE clearly specifies that any underlying HL7 v2 requirement on extension to be 15 characters does not apply. And certainly does not apply to CDA document/id which is HL7 v3 II.