The general form of a Web call is as follows:
:- libwww_request([request1, request2, ..., request_n]).
Each request has the following syntax:
request_type(+URL, +RequestParams, -ResponseParams, -Result, -Status)
The request type functor must be either htmlparse, xmlparse,
rdfparse, fetch, or header. The first two are requests to
parse HTML/XML pages, respectively. Fetch is a request to bring in a
page without parsing, nd header is a request to retrieve only the
header information (which is returned in the ResponseParams
argument--see below).
The URL must be an atom or a string (list of characters).9.1