The non-contextual content of a WITSML Product Flow Network object. The name of the Product Flow Network. This must be unique within the context of the overall Product Flow Model. A pointer to the Flow Unit that this network represents. The Unit must exist in a different Network. If a unit is not specified then the network represents the model. A model should only be represented by one network. The model network represents the overall installation. All other networks represent internal detail and should not be referenced from outside this model. The external ports on the model network represent the external ports to the overall Product Flow Model. A pointer to an external port on the Product Flow Model does not require the name of the model network because it is redundant to knowledge of the model name (i.e., there is a one-to-one correspondence). A unit model defines the internal behavior of a Flow Unit. An external port. This exposes an internal node for the purpose of allowing connections to the internal behavior of the network. Networks that represent a Flow Unit should always have external ports. If this network represents a Unit then the name of the external port must match the name of a port on the Unit (i.e., they are logically the same port). A flow behavior for one unit. Within this context, a unit represents a usage of equipment for some purpose. The unit is generally identified by its function rather than the actual equipment used to realize the function. A unit might represent something complex like a field or separator or something simple like a valve or pump. A descriptive remark about the network. Unique identifier for the network.