@techreport{TR-IC-98-33,
  number = {IC-98-33},
  author = {Alexandre Oliva and Luiz Eduardo Buzato},
  title = {Composition of Meta-Objects in {G}uaraná},
  month = {September},
  year = {1998}, 
  institution = {Institute of Computing, University of Campinas},
  note = {In English, 6 pages.
    \par\selectlanguage{english}\textbf{Abstract}
      There are meta-object protocols (MOPs) that do not provide support
      for meta-object composition.  Others require explicit modification of
      existing meta-level code or provide a limited delegation mechanism in
      order to support it.  There is much room for improvement in this field.
    \par
      The MOP of Guaraná favors the development of meta-objects that can
      be easily composed.  Composers are meta-objects that define arbitrary
      policies of delegation to other meta-objects, separating the
      implementation of meta-level functionality from its organization.
      Composers can also implement meta-level security policies, limiting
      the abilities of its component meta-objects.  Composers can be further
      composed, forming a potentially infinite reconfigurable hierarchy.
    \par
      Our MOP is currently implemented in Java$^{\rm (TM)}$.  Nevertheless, most
      design decisions presented in this paper can be transported to other
      programming languages and MOPs, improving their flexibility,
      reconfigurability, security and code reuse.
  }
}