Naming conventions for identifiers of named resources

[mrgarth]

Naming conventions for ontology items need refinement, particularly for code lists.
At present we are fairly consistent in following OWL/RDF norms of PascalCase for classes and camelCase for properties.
We have recommended a pattern for URIs for instances of classes, of [https://]/[main domain]/[nodetype]/identifier
But we haven't specified a recommended case or approach for identifiers.
The majority of code lists use PascalCase, but are not necessarily consistent. Some use alphanumeric codes.
Changing the naming convention has some serious implications for how users should handle backwards compatibility.
The named instances of Organization for definedBy use lowercase for the identifiers.