The group of non-contextual elements that define a completion string within the context of a wellbore. The type of tubular assembly. The measured depth at the top. The measured depth at the base. The true vertical depth at the top. The true vertical depth at the base. The date on which the string was installed. The date and time at which the string was instlled. These are the items of equipment that are commonly found in a completion string. MISSING ITEMS: power and gauge cable, capillary tube. This is a rod string within a completion string. It is not defined how this rod string is connected to the prime mover at the surface. QUESTION: What about other pumping methods? The effective length of the string. The effective volume of the string. xxxxxxxxxxxxxxxxxx A collector for completion string classes. A recording of a status associated with the string. An event associated with the string. A remark about the string.