readReut21578XML(elem, load, language, id)list with the two named elements content
and uri. The first element holds the document to
be read in, the second element holds a call to extract this
document. The call is evaluated upon a request for lcharacter 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.XMLTextDocument.getReaders to list available reader functions.