OASIS Mailing List ArchivesView the OASIS mailing list archive below
or browse/search using MarkMail.


Help: OASIS Mailing Lists Help | MarkMail Help



   RE: CDATA Section [binary data in...]

[ Lists Home | Date Index | Thread Index ]
  • From: "Gordon, Simon" <Simon.Gordon@swi.galileo.com>
  • To: "'Ken Gentle'" <j.kenneth.gentle@acm.org>, xml-dev@ic.ac.uk
  • Date: Fri, 29 Oct 1999 10:24:13 -0600

-----Original Message-----
From: Ken Gentle [mailto:j.kenneth.gentle@acm.org]
Sent: Wednesday, October 27, 1999 12:04
To: xml-dev@ic.ac.uk
Subject: Re: CDATA Section [binary data in...]

>>At 11:33 AM 10/27/99 -0600, you wrote:
>>Remember the XML 1.0 definition: CDATA sections are "used to escape blocks
>>of text containing characters which would otherwise be recognized as
>>markup".  Nothing about this implies including XML-illegal characters.
>>Re Tim Bray's "CDATA Sections and Binary Data" note:
>>    http://www.xml.com/axml/notes/CDprob.html
>>I've never read this to state that you can put _raw_ binary data in a
>>section.  The phrase "When you look at CDATA, you might get the impression
>>that you could maybe jam your binary data in a CDATA section. You'd be
>>right, but..." may be a little misleading, but do remember that these are
>>just explanatory notes that can never be taken to contradict the XML 1.0
>>spec itself!
>>Yes, base64 is a good method of cramming binary data into a CDATA section,
>>just be certain that a "]]" can't appear in the encoded data.
>Can't happen in base64 -- neither "]" nor ">" are legal characters.
>This is precisely how our application is embedding "binary" data in XML
>documents:  Base64 transfer encoding in a CDATA section.

As Tim says in his annotation, if you use Base64 then you don't need the
CDATA section as _none_ of the XML reserved chars appear in the Base64
character set (A-Za-z0-9/+).
>	Ken
>> Nik O, Teton Data Systems, Jackson, Wyo.


Simon Gordon
Systems Engineer,
Systems Integration,

xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@ic.ac.uk
Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1
To unsubscribe, mailto:majordomo@ic.ac.uk the following message;
unsubscribe xml-dev
To subscribe to the digests, mailto:majordomo@ic.ac.uk the following message;
subscribe xml-dev-digest
List coordinator, Henry Rzepa (mailto:rzepa@ic.ac.uk)


News | XML in Industry | Calendar | XML Registry
Marketplace | Resources | MyXML.org | Sponsors | Privacy Statement

Copyright 2001 XML.org. This site is hosted by OASIS