Column data path. You can Describes the relationship between the columns. Fields that are separated from other fields by a dot are considered to be dependant . If the dependant field is named Representation, the field is considered to be a representation of a parent field.
For example, there are two columns; the data path for the first column is Contractor, while the second one is Contractor.Representation. In this case, the second column is a representation of the first one.