[perl-xml-cvs] CVS: perl-xml-faq perl-xml-faq.xml,1.4,1.5

[Grant M. <gr...@us...>]

Update of /cvsroot/perl-xml/perl-xml-faq
In directory usw-pr-cvs1:/tmp/cvs-serv8157

Modified Files:
	perl-xml-faq.xml 
Log Message:
- fixed CDATA typo
- Added regex from Andreas Koenig
- Added question on 'invalid character number'

Index: perl-xml-faq.xml
===================================================================
RCS file: /cvsroot/perl-xml/perl-xml-faq/perl-xml-faq.xml,v
retrieving revision 1.4
retrieving revision 1.5
diff -u -d -r1.4 -r1.5
--- perl-xml-faq.xml	17 Apr 2002 20:45:49 -0000	1.4
+++ perl-xml-faq.xml	19 Apr 2002 20:38:47 -0000	1.5
@@ -1027,9 +1027,22 @@
       </formalpara>
 
       <programlisting><![CDATA[
+use utf8;
+
 s/([\x{80}-\x{FFFF}])/'&#' . ord($1) . ';'/gse;
 	]]></programlisting>
 
+      <para>Andreas Koenig has supplied an alternative regular
+      expression:</para>
+
+      <programlisting><![CDATA[
+s/([^\x20-\x7F])/'&#' . ord($1) . ';'/gse;
+	]]></programlisting>
+
+      <para>This version does not require 'use utf8'; does not require a
+      version of Perl which recognises \x{NN} and handles characters
+      outside the 0x80-0xFFFF range.</para>
+
       <para>Even if you are outputting Latin1, you will need to use a technique
       like this for all characters beyond position 255 (eg: the Euro symbol)
       since there is no other way to represent them in Latin1.</para>
@@ -1731,6 +1744,29 @@
     </answer>
   </qandaentry>
 
+  <qandaentry id="invalid_char_num">
+    <question>
+      <para>'reference to invalid character number'</para>
+    </question>
+    <answer>
+
+      <para>The XML spec defines <ulink
+      url="http://www.w3.org/TR/1998/REC-xml-19980210.html#NT-Char">legal
+      characters</ulink> as tab (0x09), carriage return (0x0D), line feed
+      (0x0A) and the legal graphic characters of Unicode.  This specifically
+      excludes control characters, so this would not be well-formed:</para>
+
+      <programlisting><![CDATA[
+<char>&#3;</char>
+      ]]></programlisting>
+
+      <para>Their really is no easy or standard way to include control
+      characters in XML - binary data must be encoded (for example using
+      <classname>MIME::Base64</classname>).</para>
+
+    </answer>
+  </qandaentry>
+
   <qandaentry id="using_cdata">
     <question>
       <para>Embedding Arbitrary Text in XML</para>
@@ -1745,11 +1781,11 @@
       example, this XML document ...</para>
 
       <programlisting><![CDATA[
-<code>&lt;![CDATA[
+<code><![CDATA[
   if($qty < 1) {
     print "<p>Invalid quantity!</p>";
   }
-]]&gt;</code>
+]]>]]&gt;<![CDATA[</code>
 	]]></programlisting>
 
       <para>is equivalent to this document ...</para>