\section{\module{xml.sax.saxutils} ---         SAX Utilities} \declaremodule{standard}{xml.sax.saxutils}\modulesynopsis{Convenience functions and classes for use with SAX.}\sectionauthor{Martin v. L\"owis}{martin@v.loewis.de}\moduleauthor{Lars Marius Garshol}{larsga@garshol.priv.no} \versionadded{2.0}  The module \module{xml.sax.saxutils} contains a number of classes andfunctions that are commonly useful when creating SAX applications,either in direct use, or as base classes. \begin{funcdesc}{escape}{data\optional{, entities}}  Escape \character{\&}, \character{<}, and \character{>} in a string  of data.   You can escape other strings of data by passing a dictionary as the  optional \var{entities} parameter.  The keys and values must all be  strings; each key will be replaced with its corresponding value.\end{funcdesc} \begin{funcdesc}{unescape}{data\optional{, entities}}  Unescape \character{\&amp;}, \character{\&lt;}, and \character{\&gt;}  in a string of data.   You can unescape other strings of data by passing a dictionary as the  optional \var{entities} parameter.  The keys and values must all be  strings; each key will be replaced with its corresponding value.   \versionadded{2.3}\end{funcdesc} \begin{funcdesc}{quoteattr}{data\optional{, entities}}  Similar to \function{escape()}, but also prepares \var{data} to be  used as an attribute value.  The return value is a quoted version of  \var{data} with any additional required replacements.  \function{quoteattr()} will select a quote character based on the  content of \var{data}, attempting to avoid encoding any quote  characters in the string.  If both single- and double-quote  characters are already in \var{data}, the double-quote characters  will be encoded and \var{data} will be wrapped in double-quotes.  The  resulting string can be used directly as an attribute value: \begin{verbatim}>>> print "<element attr=%s>" % quoteattr("ab ' cd \" ef")<element attr="ab ' cd &quot; ef">\end{verbatim}   This function is useful when generating attribute values for HTML or  any SGML using the reference concrete syntax.  \versionadded{2.2}\end{funcdesc} \begin{classdesc}{XMLGenerator}{\optional{out\optional{, encoding}}}  This class implements the \class{ContentHandler} interface by  writing SAX events back into an XML document. In other words, using  an \class{XMLGenerator} as the content handler will reproduce the  original document being parsed. \var{out} should be a file-like  object which will default to \var{sys.stdout}. \var{encoding} is the  encoding of the output stream which defaults to \code{'iso-8859-1'}.\end{classdesc} \begin{classdesc}{XMLFilterBase}{base}  This class is designed to sit between an \class{XMLReader} and the  client application's event handlers.  By default, it does nothing  but pass requests up to the reader and events on to the handlers  unmodified, but subclasses can override specific methods to modify  the event stream or the configuration requests as they pass through.\end{classdesc} \begin{funcdesc}{prepare_input_source}{source\optional{, base}}  This function takes an input source and an optional base URL and  returns a fully resolved \class{InputSource} object ready for  reading.  The input source can be given as a string, a file-like  object, or an \class{InputSource} object; parsers will use this  function to implement the polymorphic \var{source} argument to their  \method{parse()} method.\end{funcdesc}