readGmane(...)function with the signature elem, language, load, id:list with the two named elements content
and uri. The first element must hold the document to
be read in, the second element must hold a call to extract this
document. The call is evaluated upon a request for load on demand.character vector giving the text's language.logical value indicating whether the document
corpus should be immediately loaded into memory.character vector representing a unique identification
string for the returned text document.NewsgroupDocument representing
content.getReaders to list available reader functions.