# text.div
This code system http://hl7.org/fhir/map-source-list-mode defines the following codes:

Code | Display | Definition
first | First | Only process this rule for the first in the list.
not_first | All but the first | Process this rule for all but the first.
last | Last | Only process this rule for the last in the list.
not_last | All but the last | Process this rule for all but the last.
only_one | Enforce only one | Only process this rule is there is only item.

# description
If field is a list, how to manage the source.

# concept[].definition
Only process this rule for the first in the list.

# concept[].definition
Process this rule for all but the first.

# concept[].definition
Only process this rule for the last in the list.

# concept[].definition
Only process this rule is there is only item.