twhiteaker commented on this pull request.


>  
+A taxon is a named level within a biological classification, such as a class, 
genus and species. Quantities dependent on taxa have generic standard names 
containing the phrase "organisms_in_taxon", and the taxa are identified by 
auxiliary coordinate variables.
+
+The taxon auxiliary coordinate variables are string-valued. The plain-language 
name of the taxon must be contained in a variable with **`standard_name`** of 
**`biological_taxon_name`**. A Life Science Identifier (LSID) may be contained 
in a variable with **`standard_name`** of **`biological_taxon_lsid`**. This is 
a URN with the syntax 
"urn:lsid:<Authority>:<Namespace>:<ObjectID>[:<Version>]". This includes the 
reference classification in the <Authority> element and these are restricted by 
the LSID governance. It is strongly recommended in CF that the authority chosen 
is World Register of Marine Species (WoRMS) for oceanographic data and 
Integrated Taxonomic Information System (ITIS) for freshwater and terrestrial 
data. WoRMS LSIDs are built from the WoRMS AphiaID  taxon identifier such as 
"urn:lsid:marinespecies.org:taxname:104464" for AphiaID 104464. This may be 
converted to a URL by adding prefixes such as ​http://lsid.twg.org/. ITIS LSIDs 
are built from the ITIS Taxonomic Serial Number (TSN), such as 
"urn:lsid:itis.gov:itis_tsn:180543".

http://lsid.twg.org/ should be changed to http://www.lsid.info
```suggestion
The taxon auxiliary coordinate variables are string-valued. The plain-language 
name of the taxon must be contained in a variable with **`standard_name`** of 
**`biological_taxon_name`**. A Life Science Identifier (LSID) may be contained 
in a variable with **`standard_name`** of **`biological_taxon_lsid`**. This is 
a URN with the syntax 
"urn:lsid:<Authority>:<Namespace>:<ObjectID>[:<Version>]". This includes the 
reference classification in the <Authority> element and these are restricted by 
the LSID governance. It is strongly recommended in CF that the authority chosen 
is World Register of Marine Species (WoRMS) for oceanographic data and 
Integrated Taxonomic Information System (ITIS) for freshwater and terrestrial 
data. WoRMS LSIDs are built from the WoRMS AphiaID  taxon identifier such as 
"urn:lsid:marinespecies.org:taxname:104464" for AphiaID 104464. This may be 
converted to a URL by adding prefixes such as ​http://www.lsid.info/. ITIS 
LSIDs are built from the ITIS Taxonomic Serial Number (TSN), such as 
"urn:lsid:itis.gov:itis_tsn:180543".
```

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