\name{getEFO}
\alias{getEFO}
\title{Returns an instance of the EFO ontology parser}
\description{
   Loads the latest EFO version on the fly, creating the inferred ontology classes.
}
\usage{
getEFO()
}
\value{
    Returns an instance of the \code{\linkS4class{Ontology}} class.
}
\references{
    Adamusiak T, Burdett T, van der Velde K J, Abeygunawardena N, Antonakaki D, Parkinson H and Swertz M: OntoCAT -- a simpler way to access ontology resources. \emph{Available from Nature Precedings} \url{http://dx.doi.org/10.1038/npre.2010.4666.1} (2010)  
    
    Malone J, Holloway E, Adamusiak T, Kapushesky M, Zheng J, Kolesnikov N, Zhukova A, Brazma A, Parkinson H: Modeling Sample Variables with an Experimental Factor Ontology. \emph{Bioinformatics} 2010, \bold{26}(8):1112--1118 
    
    Experimental Factor Ontology \url{http://www.ebi.ac.uk/efo}
    
    Ontology Common API Tasks java library \url{http://www.ontocat.org}
    
    Java sources and javadocs: \url{http://sourceforge.net/projects/ontocat/files/}
}
\author{Natalja Kurbatova}
\seealso{\code{\linkS4class{Ontology}} and \code{\linkS4class{OntologyTerm}}}
\examples{
efo<-getEFO()
getEFOBranchRootIds(efo)
getTermParentsById(efo,"EFO_0001221")
term_efo <- getTermById(efo,"EFO_0000322")
isEFOBranchRoot(efo,term_efo)
searchTermPrefix(efo,"leuk")
getTermAndAllChildren(efo,term_efo)
}