Table 1. Description of HyPaLib items.

Kind	Description	Featurea	Remark
ID	Identifier	mu	Unique name of a hybrid pattern
DT	Date	mu	List of creation/modification dates in format DD/MM/YYYY
DE	Description	m	Informal description or comment
KW	Keyword		List of keywords useful for database search
HP	Hybrid Pattern	u	Formal definition in the syntax of HyPaL
NO	EMBL-Number		Release of EMBL according to which hybrid pattern was verified
AL	Alignment		Aligned sequences and properties describing their origins
CS	Consensus Sequence	u	Consensus sequence of aligned sequences (‘-’ is used to align the consensus sequence with the consensus structure)
ST	Consensus Structure	u	Valid secondary structure in Vienna format (bracket-dot notation)
PM	Parameters		Special parameters
RE	References		List of references

^am means a mandatory item and u means a unique item.