Existing Wording: The FHIR specification defines a set of data types that are used for the resource elements. There are four categories of data types:

• Simple / primitive types, which are single elements with a primitive value (below)

• General purpose complex types, which are re-usable clusters of elements (below)

• Metadata types: A set of types for use with metadata resources (todo: provide link when pattern is defined)

• Special purpose data types - defined elsewhere in the specification for specific usages

...

base64: ... Todo: is it possible to impose an upper absolute limit on a base64Binary (for denial of service reasons, like on string)?

Comment:

There should not be a "todo" in normative content.

Define pattern and provide link in intro.

Resolve question and update on base64

Summary:

Remove "todos" from datatype content.