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\name{libxmlVersion}
\alias{libxmlVersion}
\alias{libxmlFeatures}
\title{Query the version and available features of the libxml library.}
\description{
\code{libxmlVersion} retrieves the version of the libxml
library used when installing this XML package.
\code{libxmlFeatures} returns a named logical vector
indicating which features are enabled.
}
\usage{
libxmlVersion(runTime = FALSE)
libxmlFeatures()
}
\arguments{
\item{runTime}{a logical value indicating whether to retrieve the version information
describing libxml when the R package was compiled or the run-time version.
These may be different if a) a new version of libxml2 is installed after the package is installed,
b) if the package was installed as a binary package built on a different machine.
}
}
\value{
\code{libxmlVersion} returns a named list with
fields
\item{major}{the major version number, either 1 or 2
indicating the old or new-style library.}
\item{minor}{the within version release number.}
\item{patch}{the within minor release version number}
\code{libxmlFeatures} returns a logical vector with names given by:
\code{
[1] "THREAD" "TREE" "OUTPUT" "PUSH" "READER"
[6] "PATTERN" "WRITER" "SAX1" "FTP" "HTTP"
[11] "VALID" "HTML" "LEGACY" "C14N" "CATALOG"
[16] "XPATH" "XPTR" "XINCLUDE" "ICONV" "ISO8859X"
[21] "UNICODE" "REGEXP" "AUTOMATA" "EXPR" "SCHEMAS"
[26] "SCHEMATRON" "MODULES" "DEBUG" "DEBUG_MEM" "DEBUG_RUN"
[31] "ZLIB"
}
Elements are either \code{TRUE} or \code{FALSE} indicating whether support
was activatd for that feature, or \code{NA} if that feature is not
part of the particular version of libcurl.
}
\references{\url{https://www.w3.org/XML/}, \url{http://www.xmlsoft.org},
\url{https://www.omegahat.net} }
\author{ Duncan Temple Lang }
%\seealso{}
\examples{
ver <- libxmlVersion()
if(is.null(ver)) {
cat("Relly old version of libxml\n")
} else {
if(ver$major > 1) {
cat("Using libxml2\n")
}
}
}
\keyword{IO}
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