\name{getGOLevel}
\alias{getGOLevel}
\title{get GOIDs at a specific level}
\usage{
  getGOLevel(ont, level)
}
\arguments{
  \item{ont}{Ontology}

  \item{level}{GO level}
}
\value{
  a vector of GOIDs
}
\description{
  query GOIDs at a specific level.
}
\author{
  Guangchuang Yu \url{http://ygc.name}
}