go-show-assocs-by-node.pl - find association for a GO term
go-show-assocs-by-node.pl -id GO:0008021 gene_ontology.obo gene_associations.fb
performs a count of gene products, rather than listing them
writes parse errors in XML - defaults to STDERR (there should be no parse errors in well formed files)
determines which parser to use; if left unspecified, will make a guess based on file suffix. See below for formats
