Set the label in a mapping script to the field name type.
The contents of the field type will designate the vertex label. For instance, if a record in the data file has the field type entered as author, then the record will be read into a vertex with the vertex label set to author. The next record might instead have a value of recipe for the type field, and the data will be read into a vertex with a vertex label set to recipe. Thus, mixed sets of data can be read from a single input data file.