document the exceptions raised by sgmllib, htmllib, and HTMLParser
diff --git a/Doc/lib/libhtmlparser.tex b/Doc/lib/libhtmlparser.tex
index 5ba8e86..b85ba56 100644
--- a/Doc/lib/libhtmlparser.tex
+++ b/Doc/lib/libhtmlparser.tex
@@ -4,6 +4,8 @@
\declaremodule{standard}{HTMLParser}
\modulesynopsis{A simple parser that can handle HTML and XHTML.}
+\versionadded{2.2}
+
This module defines a class \class{HTMLParser} which serves as the
basis for parsing text files formatted in HTML\index{HTML} (HyperText
Mark-up Language) and XHTML.\index{XHTML} Unlike the parser in
@@ -23,6 +25,17 @@
elements which are closed implicitly by closing an outer element.
\end{classdesc}
+An exception is defined as well:
+
+\begin{excdesc}{HTMLParseError}
+Exception raised by the \class{HTMLParser} class when it encounters an
+error while parsing. This exception provides three attributes:
+\member{msg} is a brief message explaining the error, \member{lineno}
+is the number of the line on which the broken construct was detected,
+and \member{offset} is the number of characters into the line at which
+the construct starts.
+\end{excdesc}
+
\class{HTMLParser} instances have the following methods: