Specification for assessment content package unit.
Accepts the following message:
ISO-language code
Default sorting is alpha-numeric.
If true, the unique item identifier will be composed of the unit alias and the item id. If false, the item id has no prefix.
Refers to the variable providing its score as item value
Additional properties are NOT allowed.
All digital objects being part of the unit
Id/path to find the digital object
Describes the function of the dependency.