Add a reference item pointing to the Namespaces in XML recommendation.

Convert the existing reference items to \seetitle markup.

Doc/lib/libxmllib.tex

@@ -236,20 +236,23 @@ implementation calls \method{syntax_error()} to signal an error.
 
 
 \begin{seealso}
-  \seetext{The XML specification, published by the World Wide Web
-           Consortium (W3C), is available online at
-           \url{http://www.w3.org/TR/REC-xml}.  References to
-           additional material on XML are available at
+  \seetitle[http://www.w3.org/TR/REC-xml]{Extensible Markup Language
+            (XML) 1.0}{The XML specification, published by the World
+            Wide Web Consortium (W3C), defines the syntax and
+            processor requirements for XML.  References to additional
+            material on XML, including translations of the
+            specification, are available at
             \url{http://www.w3.org/XML/}.}
 
-  \seetext{The Python XML Topic Guide provides a great deal of information
-           on using XML from Python and links to other sources of information
-           on XML.  It's located on the Web at
-           \url{http://www.python.org/topics/xml/}.}
+  \seetitle[http://www.python.org/topics/xml/]{Python and XML
+            Processing}{The Python XML Topic Guide provides a great
+            deal of information on using XML from Python and links to
+            other sources of information on XML.}
 
-  \seetext{The Python XML Special Interest Group is developing substantial
-           support for processing XML from Python.  See
-           \url{http://www.python.org/sigs/xml-sig/} for more information.}
+  \seetitle[http://www.python.org/sigs/xml-sig/]{SIG for XML
+            Processing in Python}{The Python XML Special Interest
+            Group is developing substantial support for processing XML
+            from Python.}
 \end{seealso}
 
 
@@ -272,3 +275,10 @@ if it were \code{'http://www.w3.org/TR/REC-html40 src'}.
 
 An older draft of the XML Namespaces proposal is also recognized, but
 triggers a warning.
+
+\begin{seealso}
+  \seetitle[http://www.w3.org/TR/REC-xml-names/]{Namespaces in XML}{
+           This World-Wide Web Consortium recommendation describes the
+           proper syntax and processing requirements for namespaces in
+           XML.}
+\end{seealso}