code: public void setPackage(PackageDeclaration pakage) {
          if (this.pakage != null) {
              updateReferences(this.pakage);
          }
          this.pakage = pakage;
          setAsParentNodeOf(pakage);
      }
docs: Sets or clear the package declarations of this compilation unit.
  
  @param pakage
  the pakage declaration to set or <code>null</code> to default package