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\name{TextDocument}
\alias{TextDocument}
\title{Text Documents}
\description{
Representing and computing on text documents.
}
\details{
\emph{Text documents} are documents containing (natural language)
text. In packages which employ the infrastructure provided by package
\pkg{NLP}, such documents are represented via the virtual S3 class
\code{"TextDocument"}: such packages then provide S3 text document
classes extending the virtual base class (such as the
\code{\link{AnnotatedPlainTextDocument}} objects provided by package
\pkg{NLP} itself).
All extension classes must provide an \code{\link{as.character}()}
method which extracts the natural language text in documents of the
respective classes in a \dQuote{suitable} (not necessarily structured)
form, as well as \code{\link{content}()} and \code{\link{meta}()}
methods for accessing the (possibly raw) document content and metadata.
In addition, the infrastructure features the generic functions
\code{\link{words}()}, \code{\link{sents}()}, etc., for which
extension classes can provide methods giving a structured view of the
text contained in documents of these classes (returning, e.g., a
character vector with the word tokens in these documents, and a list
of such character vectors).
}
\seealso{
\code{\link{AnnotatedPlainTextDocument}},
\code{\link{CoNLLTextDocument}},
\code{\link{TaggedTextDocument}}, and
\code{\link{WordListDocument}}
for the text document classes provided by package \pkg{NLP}.
}
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