$io_domain$input_subdomain
#&gt;                                                                                                                 uri
#&gt; 1             Hepatitis C virus genotype 1, https://www.ncbi.nlm.nih.gov/nuccore/22129792, 2017-01-24T09:40:17-0500
#&gt; 2 Hepatitis C virus type 1b complete genome, https://www.ncbi.nlm.nih.gov/nuccore/5420376, 2017-01-24T09:40:17-0500
#&gt; 
#&gt; $io_domain$output_subdomain
#&gt;   mediatype
#&gt; 1  text/csv
#&gt; 2  text/csv
#&gt;                   