binomen fxns: validate user entries

ropensci / taxa

taxonomic classes for R

https://docs.ropensci.org/taxa

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Closed sckott closed 7 years ago

sckott commented 7 years ago

e.g.,

[x] when using span() user either needs to pass in more than one name/rank/id or an operator like . > or :

stop or so on failing validation test