Output formats
At present, TypeDB supports two different output formats for data pipelines.
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Concept rows
Concept rows are TypeDB’s native data format. All data pipeline stages (except for the fetch stage) take streams of concepts as inputs and output streams of concept rows themselves.
A concept row is an association of named variables (the “column names”) to concepts, i.e., type labels, data instances, or literal values. A concept row may be written of the form
Schematic format of concept rows
{ $var_1=concept, $var_2=concept, ..., $var_n }
When working with optional variables in data pipelines, concept assignment may be left empty, indicated by (), e.g.:
A concept row with an empty (third) variable
{ $var_1=type_label, $var_2=3.1415, $var_3=(), $var_4=0x001 }