Commodity Code

erbium

http://resource.geosciml.org/classifier/cgi/commodity-code/erbium

definition Erbium is a chemical element in the lanthanide series, with the symbol Er and atomic number 68. A silvery-white solid metal when artificially isolated, natural erbium is always found in chemical combination with other elements on Earth. more like this
notation
02.01.03.01.02 more like this
Er more like this
source http://en.wikipedia.org/wiki/Erbium more like this
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Concept
broader hree
narrower erbium
in scheme commodity code
is primary topic of erbium