hash table
?
Structured representation of this header line
ID dictionary {FILTER/INFO/FORMAT, contig, sample} ID key/entry
?
m: allocated size of the dictionary block in use (see n above)
?
n:the size of the dictionary block in use, (allocated size, m, is below to preserve ABI)
for bcf_hdr_set_samples()
for bcf_translate()
?list of samples
for bcf_translate()
Structured repreentation of VCF header (§1.2) Note that bcf_hdr_t structs must always be created via bcf_hdr_init()