Talk about interfaces rather than implementation classes where appropriate.

Add hyperlinks to make the documentation on the Attributes and AttributesNS
interfaces more discoverable.
Closes SF bug #484603.

Doc/lib/xmlsaxhandler.tex

@@ -193,25 +193,27 @@ appropriate events in the input document:
   
   There are cases, however, when applications need to use prefixes in
   character data or in attribute values, where they cannot safely be
-  expanded automatically; the start/endPrefixMapping event supplies
-  the information to the application to expand prefixes in those
-  contexts itself, if necessary.
+  expanded automatically; the \method{startPrefixMapping()} and
+  \method{endPrefixMapping()} events supply the information to the
+  application to expand prefixes in those contexts itself, if
+  necessary.
   
-  Note that start/endPrefixMapping events are not guaranteed to be
-  properly nested relative to each-other: all
-  \method{startPrefixMapping()} events will occur before the
-  corresponding \method{startElement()} event, and all
-  \method{endPrefixMapping()} events will occur after the
-  corresponding \method{endElement()} event, but their order is not
-  guaranteed.
+  Note that \method{startPrefixMapping()} and
+  \method{endPrefixMapping()} events are not guaranteed to be properly
+  nested relative to each-other: all \method{startPrefixMapping()}
+  events will occur before the corresponding \method{startElement()}
+  event, and all \method{endPrefixMapping()} events will occur after
+  the corresponding \method{endElement()} event, but their order is
+  not guaranteed.
 \end{methoddesc}
 
 \begin{methoddesc}[ContentHandler]{endPrefixMapping}{prefix}
   End the scope of a prefix-URI mapping.
 
-  See \method{startPrefixMapping()} for details. This event will always
-  occur after the corresponding endElement event, but the order of
-  endPrefixMapping events is not otherwise guaranteed.
+  See \method{startPrefixMapping()} for details. This event will
+  always occur after the corresponding \method{endElement()} event,
+  but the order of \method{endPrefixMapping()} events is not otherwise
+  guaranteed.
 \end{methoddesc}
 
 \begin{methoddesc}[ContentHandler]{startElement}{name, attrs}
@@ -219,9 +221,10 @@ appropriate events in the input document:
 
   The \var{name} parameter contains the raw XML 1.0 name of the
   element type as a string and the \var{attrs} parameter holds an
-  instance of the \class{Attributes} class containing the attributes
-  of the element.  The object passed as \var{attrs} may be re-used by
-  the parser; holding on to a reference to it is not a reliable way to
+  object of the \ulink{\class{Attributes}
+  interface}{attributes-objects.html} containing the attributes of the
+  element.  The object passed as \var{attrs} may be re-used by the
+  parser; holding on to a reference to it is not a reliable way to
   keep a copy of the attributes.  To keep a copy of the attributes,
   use the \method{copy()} method of the \var{attrs} object.
 \end{methoddesc}
@@ -230,7 +233,7 @@ appropriate events in the input document:
   Signals the end of an element in non-namespace mode.
 
   The \var{name} parameter contains the name of the element type, just
-  as with the startElement event.
+  as with the \method{startElement()} event.
 \end{methoddesc}
 
 \begin{methoddesc}[ContentHandler]{startElementNS}{name, qname, attrs}
@@ -239,8 +242,9 @@ appropriate events in the input document:
   The \var{name} parameter contains the name of the element type as a
   \code{(\var{uri}, \var{localname})} tuple, the \var{qname} parameter
   contains the raw XML 1.0 name used in the source document, and the
-  \var{attrs} parameter holds an instance of the \class{AttributesNS}
-  class containing the attributes of the element.  If no namespace is
+  \var{attrs} parameter holds an instance of the
+  \ulink{\class{AttributesNS} interface}{attributes-ns-objects.html}
+  containing the attributes of the element.  If no namespace is
   associated with the element, the \var{uri} component of \var{name}
   will be \code{None}.  The object passed as \var{attrs} may be
   re-used by the parser; holding on to a reference to it is not a

Doc/lib/xmlsaxreader.tex

@@ -69,20 +69,27 @@ parser object.
 \end{classdesc}
 
 \begin{classdesc}{AttributesImpl}{attrs}
-  This is a dictionary-like object which represents the element
-  attributes in a \method{startElement()} call. In addition to the
-  most useful dictionary operations, it supports a number of other
-  methods as described below. Objects of this class should be
+  This is an implementation of the \ulink{\class{Attributes}
+  interface}{attributes-objects.html} (see
+  section~\ref{attributes-objects}).  This is a dictionary-like
+  object which represents the element attributes in a
+  \method{startElement()} call. In addition to the most useful
+  dictionary operations, it supports a number of other methods as
+  described by the interface. Objects of this class should be
   instantiated by readers; \var{attrs} must be a dictionary-like
-  object.
+  object containing a mapping from attribute names to attribute
+  values.
 \end{classdesc}
 
 \begin{classdesc}{AttributesNSImpl}{attrs, qnames}
-  Namespace-aware variant of attributes, which will be passed to
-  \method{startElementNS()}. It is derived from \class{AttributesImpl},
-  but understands attribute names as two-tuples of \var{namespaceURI}
-  and \var{localname}. In addition, it provides a number of methods
-  expecting qualified names as they appear in the original document.
+  Namespace-aware variant of \class{AttributesImpl}, which will be
+  passed to \method{startElementNS()}. It is derived from
+  \class{AttributesImpl}, but understands attribute names as
+  two-tuples of \var{namespaceURI} and \var{localname}. In addition,
+  it provides a number of methods expecting qualified names as they
+  appear in the original document.  This class implements the
+  \ulink{\class{AttributesNS} interface}{attributes-ns-objects.html}
+  (see section~\ref{attributes-ns-objects}).
 \end{classdesc}
 
 
@@ -288,27 +295,27 @@ Instances of \class{Locator} provide these methods:
 \end{methoddesc}
 
 
-\subsection{AttributesImpl Objects \label{attributes-impl-objects}}
+\subsection{The \class{Attributes} Interface \label{attributes-objects}}
 
-\class{AttributesImpl} objects implement a portion of the mapping
-protocol, and the methods \method{copy()}, \method{get()},
+\class{Attributes} objects implement a portion of the mapping
+protocol, including the methods \method{copy()}, \method{get()},
 \method{has_key()}, \method{items()}, \method{keys()}, and
 \method{values()}.  The following methods are also provided:
 
-\begin{methoddesc}[AttributesImpl]{getLength}{}
+\begin{methoddesc}[Attributes]{getLength}{}
   Return the number of attributes.
 \end{methoddesc}
 
-\begin{methoddesc}[AttributesImpl]{getNames}{}
+\begin{methoddesc}[Attributes]{getNames}{}
   Return the names of the attributes.
 \end{methoddesc}
 
-\begin{methoddesc}[AttributesImpl]{getType}{name}
+\begin{methoddesc}[Attributes]{getType}{name}
   Returns the type of the attribute \var{name}, which is normally
   \code{'CDATA'}.
 \end{methoddesc}
 
-\begin{methoddesc}[AttributesImpl]{getValue}{name}
+\begin{methoddesc}[Attributes]{getValue}{name}
   Return the value of attribute \var{name}.
 \end{methoddesc}
 
@@ -316,22 +323,29 @@ protocol, and the methods \method{copy()}, \method{get()},
 % here already, but documented only for derived class.
 
 
-\subsection{AttributesNSImpl Objects \label{attributes-ns-impl-objects}}
+\subsection{The \class{AttributesNS} Interface \label{attributes-ns-objects}}
 
-\begin{methoddesc}[AttributesNSImpl]{getValueByQName}{name}
+This interface is a subtype of the \ulink{\class{Attributes}
+interface}{attributes-objects.html} (see
+section~\ref{attributes-objects}).  All methods supported by that
+interface are also available on \class{AttributesNS} objects.
+
+The following methods are also available:
+
+\begin{methoddesc}[AttributesNS]{getValueByQName}{name}
   Return the value for a qualified name.
 \end{methoddesc}
 
-\begin{methoddesc}[AttributesNSImpl]{getNameByQName}{name}
+\begin{methoddesc}[AttributesNS]{getNameByQName}{name}
   Return the \code{(\var{namespace}, \var{localname})} pair for a
   qualified \var{name}.
 \end{methoddesc}
 
-\begin{methoddesc}[AttributesNSImpl]{getQNameByName}{name}
+\begin{methoddesc}[AttributesNS]{getQNameByName}{name}
   Return the qualified name for a \code{(\var{namespace},
   \var{localname})} pair.
 \end{methoddesc}
 
-\begin{methoddesc}[AttributesNSImpl]{getQNames}{}
+\begin{methoddesc}[AttributesNS]{getQNames}{}
   Return the qualified names of all attributes.
 \end{methoddesc}