| Quantity | Default constructor, creates and undefined quantity. COM requires empty constructor. Afterwards use Create(eumItem, String, String) to create the quantity. |
| Quantity(IQuantity) | Copy constructor. |
| Quantity(eumItem, String) | Construct data quantity from eumItem and description |
| Quantity(eumQuantity, String) | Construct data quantity from eumItem and description |
| Quantity(IQuantity, String) | Copy constructor with a new quantity ID. |
| Quantity(String, String, eumItem) | Construct data quantity from eumItem and description |
| Quantity(String, String, eumItem, eumUnit) | Construct data quantity from eumItem and description |