This PR contains a number of small changes and clarifications based on changes in R5 and various requests for clarification from users. The following is a list of the updates with links to their relevant sections on the CI build of this branch:
Indicate that R5 removed support for xpath invariants (3.5.6)
Indicate that slices can be discriminated by position in R5 (3.6.7.1)
Provide example of constraining Reference datatype and its targets (3.6.16)
Clarify that extension paths may also have bracketed indices (3.4.8)
Clarify correct and incorrect definition and use of aliases (3.5.2)
Clarify that Usage: #definition can be used to define any formal item in an IG (3.5.5)
Clarify value set rules syntax for versions code systems and value sets (3.5.12)
Clarify allowed value types in value set filter expressions (3.5.12.1)
This PR contains a number of small changes and clarifications based on changes in R5 and various requests for clarification from users. The following is a list of the updates with links to their relevant sections on the CI build of this branch: