Dear all, I write here as i'm in process to submit a revision of 
/geometa/ package to CRAN in which i've enabled some coercing methods 
between main metadata object ISOMetadata from geometa, and foreign 
metadata objects (from emld / ncdf4 packages)

I've received a "pre-test archived" notification, because of the 
folllowing warnings dealing with the coercing:

   Warning: in method for 'coerce' with signature '"ISOMetadata","emld"': no definition for classes "ISOMetadata", "emld"
   Warning: in method for 'coerce' with signature '"emld","ISOMetadata"': no definition for classes "emld", "ISOMetadata"
   Warning: in method for 'coerce' with signature '"ncdf4","ISOMetadata"': no definition for classes "ncdf4", "ISOMetadata"

Detail at: 
https://win-builder.r-project.org/incoming_pretest/geometa_0.5-0_20190524_153346/Windows/00check.log

I've found this thread that seems to discuss the same matter: 
https://github.com/r-spatial/sf/issues/129 . I'm facing the same 
situation where there is no good reason enough to add emld, ncdf4 as 
Imports, but rather to keep them as Suggests, as they are only used in 
these specific converters. In the doubt, i prefer asking here if there 
is some good practice to deal with these warnings, eventually to avoid 
it, or if this is considered by CRAN team as false positive.

Thanks a lot for your advice,

Best,
Emmanuel



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