Attributes are labels that are attached to entities like orders, locations and vehicles to describe their properties. Attribute names, like identifiers, must contain at least one non-whitespace character and must not contain the semicolon (;) character. They are not case or whitespace sensitive.
Attributes may be used to define relationships between the entities in a scenario. (See Section 2.17 for further details).
Note that an entity’s identifier is automatically considered to be one of its attributes.