1\name{ppp-class} 2\docType{class} 3\alias{ppp-class} 4\alias{owin-class} 5\alias{im-class} 6\alias{psp-class} 7 8\title{Virtual class "ppp" } 9\description{ Virtual S4 class definition for S3 classes in the spatstat package to allow S4-style coercion to these classes} 10\section{Objects from the Class}{A virtual Class: No objects may be created from it.} 11\author{ Edzer J. Pebesma } 12\keyword{classes} 13