[Patch #628208] Document the allow_none argument
diff --git a/Doc/lib/libxmlrpclib.tex b/Doc/lib/libxmlrpclib.tex
index b7bccdb..59d34a7 100644
--- a/Doc/lib/libxmlrpclib.tex
+++ b/Doc/lib/libxmlrpclib.tex
@@ -18,7 +18,8 @@
objects and XML on the wire.
\begin{classdesc}{ServerProxy}{uri\optional{, transport\optional{,
- encoding\optional{, verbose}}}}
+ encoding\optional{, verbose\optional{,
+ allow_none}}}}}
A \class{ServerProxy} instance is an object that manages communication
with a remote XML-RPC server. The required first argument is a URI
(Uniform Resource Indicator), and will normally be the URL of the
@@ -26,7 +27,12 @@
by default it is an internal \class{SafeTransport} instance for https:
URLs and an internal HTTP \class{Transport} instance otherwise. The
optional third argument is an encoding, by default UTF-8. The optional
-fourth argument is a debugging flag.
+fourth argument is a debugging flag. If \var{allow_none} is true,
+the Python constant \code{None} will be translated into XML; the
+default behaviour is for \code{None} to raise a \exception{TypeError}.
+This is a commonly-used extension to the XML-RPC specification, but isn't
+supported by all clients and servers; see
+\url{http://ontosys.com/xml-rpc/extensions.html} for a description.
Both the HTTP and HTTPS transports support the URL syntax extension for
HTTP Basic Authentication: \code{http://user:pass@host:port/path}. The