R: Constructor for DTD reference

Doctype {XML} | R Documentation

## Constructor for DTD reference

### Description

This is a constructor for the `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 `Doctype` object to a character string.

### Usage

    Doctype(system = character(), public = character(), name = "")

### Arguments

`system` | the system URI that locates the DTD.
`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 `system` argument, the `system` value is used as the second element of `public`. The public identifer should be of the form `+//creator//name//language` where the first element is either + or -, and the language is described by a code in the ISO 639 document.
`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 `Doctype`.

### Author(s)

Duncan Temple Lang

### References

http://www.w3.org/XML XML Elements of Style, Simon St. Laurent.

### See Also

`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")

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