text: 
  from rev.db import Model, fields
  from rev.db.mixins import XMLDataMixin
  from rev.i18n import translate as _
  
  class RevCRMModel(XMLDataMixin, Model):
      """
      Base class for rev_app metadata models
      """
      
      id = fields.RecordIDField(_('Record ID'))
      #created_by
      #created_date
      #updated_by
      #updated_date