Nothing
params <-
function(within,by='name',type='parameter',...){
if(length(by)!=1)stop('by must have length one')
if(is.na(by))return(NA)
tree <- xmlParse(within,asText=TRUE)
apath <- glue('//',type,'/@',by)
result <- xpathSApply(tree,apath)
free(tree)
if(!length(result))return(character(0))
return(result)
}
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