NPO

Not-Place-Objects are objects (pipe line and symbols) which do exist in PlantDataManager's database only. There is a distinction between GNPO and NGNPO.

GNPO

Graphical NPOs. These object will be created within PlantDataManager to be inserted into a P&ID drawing at a later time.

NGNPO

Non-Graphical NPOs. These objects will be create within PlantDataManager, but they won't be inserted into a P&ID drawing. These objects are usually used to manage these object with the project, but not to show them in the drawings.

PO

Placed Objects are objects which do exist in all P&ID drawings (in contrast to NPOs).

Tag

Tags are unique identifier of pipe lines and symbols. A Tag must exist only once in a project.