A Port that models the transfer of material, of whateverform, into our out of a ProcessStep object. This type is used flow of material: solids, liquids and gases.<br/><br/>Roles referenced via PerformedRoles should have one of the following Names: <br/>- Air<br/>- BottomProduct<br/>- ChemicalFeed<br/>- Discharge<br/>- Drain<br/>- Exhaust<br/>- Feed<br/>- Fuel<br/>- HeavyLiquid<br/>- Inlet<br/>- LeanSolvent<br/>- LightLiquid<br/>- Liquid<br/>- LiquidInlet<br/>- LiquidOutlet<br/>- Outlet<br/>- Product<br/>- Reboil<br/>- Reflux<br/>- Relief<br/>- RichSolvent<br/>- Sidedraw<br/>- Suction<br/>- TopProduct<br/>- Vapour<br/>- VapourInlet<br/>- VapourOutlet<br/>- Vent<br/>- Waste<br/>
