anchor.diff:    (:metaclass metamodel-stub-class)
     (:model *boostrap-model*)
     (:model-metaclass "uml:Class")
  -  (:cname "UML:Package"))
  +  (:qname "UML:Package"))
  
positive.code:   ;;
    ;; This class option would effectively denote a packagedElement
    ;; definition for the defining class.
    (:cname "UML:Class")
  
    ;; "uml" in the following item denotes the namespace URI assigned
    ;; to the prefix "uml"
  
negative.code:     :attribute-p t
      :local-name "name"
      :initarg :name
      :type simple-string ;; fixme: NQname
      :accessor named-element-name)
     (namespace
      ;; not directly encoded in XMI, rather derived from when a
  