text: import mongoengine
  from datetime import datetime
  
  class Tag(mongoengine.EmbeddedDocument):
      name         = mongoengine.StringField(required=True)
      content      = mongoengine.StringField(required=True)
      added_by_tag = mongoengine.StringField()
      added_by_id  = mongoengine.IntField()
      added_date   = mongoengine.DateTimeField(default=datetime.now)
      use_count    = mongoengine.IntField(default=0)
   