docs: def add_meta(self, **metadict):
          """Add meta information to a Symbol.
                  
          Parameters
          ----------
          metadict 
              Attributes are passed as keywords, with their
              associated values as strings.  For meta attributes with spaces,
              use an unpacked dict.
                      
          """
          
          objs = object_session(self)
          
          for attr,val in metadict.iteritems():
              newmeta = SymbolMeta(self, attr, val)
              self.meta.append(newmeta)
              
          objs.commit()