get_study_id(search_results)
the study id
get_study_id is deprecated, and now can be performed more easily using phylo_metadata and oai_metadata search functions.
this function is commonly used to get trees corresponding to the metadata search.
## Not run: # all <- search_metadata("", by="all")# # nature <- sapply(all, function(x) length(grep("Nature", x$publisher))>0)# science <- sapply(all, function(x) length(grep("^Science$", x$publisher))>0)# s <- get_study_id( all[nature] )# ## End(Not run)