Added information on the ExternalEntityParserCreate() method.

Doc/lib/libpyexpat.tex

@@ -80,9 +80,11 @@ http://default-namespace.org/ root
 http://www.python.org/ns/ elem1
 elem2
 \end{verbatim}
-
 \end{funcdesc}
 
+
+\subsection{XMLParser Objects \label{xmlparser-objects}}
+
 \class{xmlparser} objects have the following methods:
 
 \begin{methoddesc}[xmlparser]{Parse}{data\optional{, isfinal}}
@@ -112,6 +114,14 @@ Returns a string containing the base set by a previous call to
 \method{SetBase()} hasn't been called.
 \end{methoddesc}
 
+\begin{methoddesc}[xmlparser]{ExternalEntityParserCreate}{context\optional{,
+                                                          encoding}}
+Create a ``child'' parser which can be used to parse an external
+parsed entity referred to by content parsed by the parent parser.  The
+\var{content} parameter should be the string passed to the
+\method{ExternalEntityRefHandler()} handler function, described below.
+\end{methoddesc}
+
 
 \class{xmlparser} objects have the following attributes: