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\name{xmlSearchNs}
\alias{xmlSearchNs}
\alias{coerce,XMLNamespaceRef,character-method}
\title{Find a namespace definition object by searching ancestor nodes}
\description{
This function allows one to search an XML tree from a particular node
and find the namespace definition for a given namespace prefix or URL.
This namespace definition can then be used to set it on a node to
make it the effective namespace for that node.
}
\usage{
xmlSearchNs(node, ns, asPrefix = TRUE, doc = as(node, "XMLInternalDocument"))
}
%- maybe also 'usage' for other objects documented here.
\arguments{
\item{node}{an \code{XMLInternaElementNode}}
\item{ns}{a character string (vector of length 1).
If \code{asPrefix} is \code{TRUE}, this is the namespace
alias/prefix.
If \code{asPrefix} is \code{FALSE}, this is the URL of the namespace definition}
\item{asPrefix}{a logical value. See \code{ns}.}
\item{doc}{the XML document in which the node(s) are located}
}
\value{
An object of class XMLNamespaceRef.
}
\references{
libxml2
}
\author{
Duncan Temple Lang
}
\seealso{
\code{\link{newXMLNode}}
}
\examples{
txt = '<top xmlns:r="http://www.r-project.org"><section><bottom/></section></top>'
doc = xmlParse(txt)
bottom = xmlRoot(doc)[[1]][[1]]
xmlSearchNs(bottom, "r")
}
\keyword{programming}
\keyword{data}
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