TextDocument
.
Actual S3 text document classes then extend the virtual base class (such as
PlainTextDocument
). All extension classes must provide an as.character
method which extracts the natural language text in documents of the
respective classes in a content
and meta
methods
for accessing the (possibly raw) document content and metadata.
PlainTextDocument
, and
XMLTextDocument
for the text document classes provided by package TextDocument
for text documents in package