gem for importing and caching bibliographic references to technical standards

x = Relaton.fetch("ISO19011")
=> Relaton::Error "No such fetcher"

require 'relaton-iso'
x = Relaton.fetch("ISO19011")
=> <# Relaton::Iso @docidentifier: "ISO 19011:2011" ... >

x.to_xml
=> <bib-item ...>