If 'output' parameter is "S4", betfairly api
functions return an S4 object. The structure of this
object is described by the WSDL betfair service file.
For parsimony reasons the betfairly S4 classes are not
installed with the package. You need to run
bfInitClasses() to initialize the S4 interface.
Note what the package XMLSchema from
www.omegahat.org is needed for this:
 install.packages("XMLSchema") ## binaries 
or
 install.packages("XMLSchema", repos =
  "http://www.omegahat.org/R", type = "source")
'betfairly-package'
'link{bfInitClasses}'
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