# description
How the referenced structure is used in this mapping.

# concept[].definition
This structure describes an instance passed to the mapping engine that is used a source of data.

# concept[].definition
This structure describes an instance that the mapping engine may ask for that is used a source of data.

# concept[].definition
This structure describes an instance passed to the mapping engine that is used a target of data.

# concept[].definition
This structure describes an instance that the mapping engine may ask to create that is used a target of data.