Related resources such as additional documentation, justification, or bibliographic references.

Modules must be able to provide enough information for consumers of the content (and/or interventions or results produced by the content) to be able to determine and understand the justification for and evidence in support of the content.

Each related resource is either an attachment, or a reference to another resource, but not both.

The type of related resource.

A brief description of the document or resource being referenced, suitable for display to a consumer.

A bibliographic citation for the related resource. This text SHOULD be formatted according to an accepted citation format.

Additional structured information about citations should be captured as extensions.

A url for the resource that can be followed to access the actual content.

If a document or resource element is present, this element SHALL NOT be provided (use the url or reference in the Attachment or resource reference).

The document being referenced, represented as an attachment. This is exclusive with the resource element.

The related resource, such as a library, value set, profile, or other module.

If the type is predecessor, this is a reference to the succeeding module. If the type is successor, this is a reference to the prior module.