Table 2. Overview of file-format data structures captured by GFVO.

Overview of the number of data structures (columns, key/value pairs, other) in genomics file formats that are captured by GFVO and other ontologies/frameworks.

Specification	Fixed columns	Feature attributes and key/value properties	Pragma statements and information fields
Table column description	Columns with a single data type	Boolean attributes and key/value properties directly associated with genomic features	Other information that is stated in the header or outside of the scope of genomic feature annotations (e.g., comments or FASTA appendix)
	Entities identified in specification and represented by classes in GFVO; entities represented in other ontologies/frameworks as either class or property are noted in brackets
GFF3	8 (+1 SO)	5	5 (+4 RDF schema)
GTF	9	n/a	6
GVF	8 (+1 SO)	25	27 (+4 RDF schema)
VCF	6	24	15