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1041322
2015 Mar 12
2
Understanding why "no metadata object found ... not exported?" warnings from the methods package exist, and what they mean
Hi
I am seeking to understand why the methods package (to be specific
`methods:::.findOrCopyClass` when called by `setIs` when called by
`setClass`) emits a warning message such as
` class "SpatialLinesNULL" is defined (with package slot 'rgeos') but no
metadata object found to revise subclass information---not exported? Making
a copy in package 'minweSpatialNULL `