Catalog entries are wrappers that contextualize items included in a catalog.

Used in supporting different identifiers for the same product, e.g. manufacturer code and retailer code.

The type of item - medication, device, service, protocol or other.

Whether the entry represents an orderable item.

The item in a catalog or definition.

Used in supporting related concepts, e.g. NDC to RxNorm.

Classes of devices, or ATC for medication.

Used to support catalog exchange even for unsupported products, e.g. getting list of medications even if not prescribable.

The time period in which this catalog entry is expected to be active.

Typically date of issue is different from the beginning of the validity. This can be used to see when an item was last updated.

Perhaps not needed - if we use fhir resource metadata.

Used for examplefor Out of Formulary, or any specifics.

User for example for ATC classification, or.

Used for example, to point to a substance, or to a device used to administer a medication.

The type of relation to the related item: child, parent, packageContent, containerPackage, usedIn, uses, requires, etc.

The reference to the related item.