[Rspatial-devel] rgeos exportClasses SpatialLinesNULL

[Edzer Pebesma]

A package that imports (anything from) rgeos and declares

MyClass1 <- setClass('MyClass1', contains = c('SpatialLines'))
MyClass2 <- setClass('MyClass2', contains = c('MyClass1'))

keeps getting the warning: "Found the following significant warnings:
  Warning: 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’"

See
http://stackoverflow.com/questions/28871632/how-to-resolve-warning-messages-metadata-object-not-found-spatiallinesnull-cla

I don't understand why this is, but so do I not understand ClassUnions.
I'm resolving this by having rgeos exportClass SpatialLinesNULL and all
the other *NULL classes. (Having it not exportClass SpatialCollections
did not resolve the problem either).
-- 
Edzer Pebesma
Institute for Geoinformatics (ifgi),  University of Münster,
Heisenbergstraße 2, 48149 Münster, Germany; +49 251 83 33081
Journal of Statistical Software:   http://www.jstatsoft.org/
Computers & Geosciences:   http://elsevier.com/locate/cageo/
Spatial Statistics Society http://www.spatialstatistics.info

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