Use reml to parse EML metadata coming from the dataone library about eml HOT 1 CLOSED

@mbjones Great question. @duncantl might have better insight on this, but:

My intuition is that the dataone package would list reml in DESCRIPTION Suggests list, along with other such schema-specific parser packages. Likewise, reml would list dataone in it's Suggests list, along with any other packages that provide publishing platforms (e.g. rfigshare).

I think this avoids a hard dependency and sidesteps the question of who depends on who (e.g. which package must be installed first). When we have a function in reml that calls the dataone API for downloading / uploading, the user could be prompted to install the dataone package. Likewise a user of the dataone package would always be able to explore the XML with basic xpath tools as you show above, but could be prompted to load the reml package for advanced methods when handling EML files.

The looser dependency also means that if you don't care about a certain feature (say, publishing to figshare) then you don't need to install the rfigshare package just to use reml. Make sense? @duncantl two packages can suggest each-other in this way, right?

from eml.