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Format hierarchies
Can arrange formats by the structure of their tags
sequence ::= swissprot | embl | genbank | fasta | ...
swissprot ::= sprot40 | sprot39 | sprot38 | ..
...
search ::= blast | fasta
blast ::= blastp | blastn | blastx | ...
blastp ::= ncbi-blastp | wu-blastp
...
Format recognition means given a node in the tree, find the first
subleaf that matches.
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