Nothing
#---------------------------------------------------------------------------
#
# This file holds the S4 class union definitions that are used in the
# sampSurf package classes.
#
# classUnion...
# 1. numericNull
#
#Author... Date: 26-Aug-2010
# Jeffrey H. Gove
# USDA Forest Service
# Northern Research Station
# 271 Mast Road
# Durham, NH 03824
# jhgove@unh.edu
# phone: 603-868-7667 fax: 603-868-7604
#---------------------------------------------------------------------------
#
# used for solidType in downLog object...
#
setClassUnion('numericNULL', c('numeric', 'NULL'))
#
# general data frame class that allows 'missing' in function arguments...
#
#setClassUnion('missDF', c('data.frame','missing'))
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