User Definition data is the set of attributes directly connected to a single User. The User is a human, machine or process. These attributes are defined in a User Definition XML. This XML schema is discussed in the Workflow Guide/Section 3.1.1.2 Example of User XML schema.
A User Definition is added as a User block in the ID Definition XML.
Every UXP Object must include at least one User Definition in the ID Definition XML.
The User Definition is owned, created and managed by the single User, not the UXP Identity owner / creator.
Machine User Definition: A machine User Definition is an automated process creating the following attributes:
Human User Definition: A human User Definition consists of the following attributes:
Each User Definition includes a set of Challenge Pairs. For a machine or process User Definition, the Challenge Pairs are automatically generated. However, for a human User Definition, the Challenge Pairs are manually created by the individual User.