# concept[].definition
A transformation of an entity into another, an update of an entity resulting in a new one, or the construction of a new entity based on a pre-existing entity.

# concept[].concept[].definition
A derivation for which the resulting entity is a revised version of some original.

# concept[].concept[].definition
The repeat of (some or all of) an entity, such as text or image, by someone who might or might not be its original author.

# concept[].concept[].definition
A primary source for a topic refers to something produced by some agent with direct experience and knowledge about the topic, at the time of the topic's study, without benefit from hindsight.

# concept[].concept[].definition
A derivation for which the entity is removed from accessibility usually through the use of the Delete operation.