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RE: binary base64 definition
- From: Jerry Johns <Jjohns@computerlogic.com>
- To: 'Ian Graham' <email@example.com>, Dan Vint <firstname.lastname@example.org>
- Date: Sat, 06 Jan 2001 15:31:35 -0500
What if I ditched DOM and used another tool for managing the XML file; could
I then insert the base64 content and still be within the XML standards? Is
this a limitate of DOM? Thanks. Jerry
From: Ian Graham [mailto:email@example.com]
Sent: Saturday, January 06, 2001 10:50 AM
To: Dan Vint
Cc: Jerry Johns; 'firstname.lastname@example.org'
Subject: Re: binary base64 definition
The DOM supports access to notation nodes, but can enforce no statement
aobut the proper encoding of a referenced external entity (which makes
sense, as it is external to the document).
Base64 encoding of content inside a document would require custom code for
doing the encoding/decoding, and some attribute-based mechanism for
labeling the 'type' content of the node containing the data. That is
certainly possible, but as far as I can see is outside the scope of the
On Fri, 5 Jan 2001, Dan Vint wrote:
> You can't use elements this way, but an alternative would be to create a
> NOTATION type and then an external entity of this type - you would copy
> the contents of whatever should be base 64 into this external file, it
> would be part of the XML document but it would be outside. Not sure if
> DOM has been setup to understand NOTATIONS, but in an SGML world you would
> be able to associcate a "processor" with that notation and have it called
> whenever you needed to read or write that format.
> Your DTD might look like the following:
> <!DOCTYPE .... [
> <!NOTATION base64 SYSTEM "binary base64">
> <!ENTITY extfile1 SYSTEM "extfile.b64" NOTATION "base64" >
> The syntax is probably not exact but you can look up the details.
> > In the DTD, can I specify a type of "binary base64" for an element so
> > when I write to the XML file using DOM, DOM will automatically encode
> > binary data for me without parsing for control characters? If so, I
> > it will do the reverse when I read that element.
> > Can anyone validate my assumption about the DTD data type? Has anyone
> > an example DTD definition with this in it?
> > Thanks much.
> > Jerry