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\name{Doctype}
\alias{Doctype}
\alias{coerce,Doctype,character-method}
\title{Constructor for DTD reference}
\description{
This is a constructor for the \code{Doctype} class
that can be provided at the top of an XML document
to provide information about the class of document,
i.e. its DTD or schema.
Also, there is a method for converting such a \code{Doctype}
object to a character string.
}
\usage{
Doctype(system = character(), public = character(), name = "")
}
\arguments{
\item{system}{the system URI that locates the DTD. }
\item{public}{the identifier for locating the DTD in a catalog, for
example. This should be a character vector of length 2, giving
the public identifier and a URI. If just the public identifier
is given and a string is given for \code{system} argument,
the \code{system} value is used as the second element of
\code{public}.
The public identifer should be of the form
\code{+//creator//name//language}
where the first element is either + or -, and
the language is described by a code in the ISO 639 document.
}
\item{name}{the name of the root element in the document.
This should be the first parameter, but is left this way
for backward compatability. And }
}
\value{
An object of class \code{Doctype}.
}
\references{\url{https://www.w3.org/XML/}
XML Elements of Style, Simon St. Laurent.
}
\author{ Duncan Temple Lang }
\seealso{
\code{\link{saveXML}}
}
\examples{
d = Doctype(name = "section",
public = c("-//OASIS//DTD DocBook XML V4.2//EN",
"http://oasis-open.org/docbook/xml/4.2/docbookx.dtd"))
as(d, "character")
# this call switches the system to the URI associated with the PUBLIC element.
d = Doctype(name = "section",
public = c("-//OASIS//DTD DocBook XML V4.2//EN"),
system = "http://oasis-open.org/docbook/xml/4.2/docbookx.dtd")
}
\keyword{IO}
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