code: def filter(self, value=None, exclude=False, **selection):
          
          filters = self.meta.setdefault('filters', [])
  
          if value and len(selection):
              raise ValueError("Cannot specify a filter string and a filter keyword selection at the same time.")
          elif value:
              value = [value]
          elif len(selection):
              value = select(self.api.columns, selection, invert=exclude)
  
          filters.append(value)
          self.raw['filters'] = utils.paste(filters, ',', ';')
          return self
docs: Most of the actual functionality lives on the Column
          object and the `all` and `any` functions.