SWI-Prolog -- put_attr/3

Documentation
- Reference manual
  - Constraint Logic Programming
    - Attributed variables
      - Attribute manipulation predicates
        
        attvar/1
        
        put_attr/3
        
        get_attr/3
        
        del_attr/2
- Packages

dt class="pubdef">put_attr(+Var, +Module, +Value)