Re: [xml] using large binary chunks / binary XML?

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From: Timothee Besset (timo@qeradiant.com)
Date: Wed Jan 03 2001 - 18:45:42 EST

Great!

I was kinda desesperate to get an answer to this post. I guess everyone was
on vacation. I am going to read through the dev@xml.openoffice.org. BTW,
what is the purpose of having two lists? xml@rpmfind.net and
dev@xml.openoffice.org?

I am available to invest some time into developement and testing whatever
XML implementation which will allow usage of large binary chunks. We should
have direct applications within a few months.

regards

TTimo

At 08:25 PM 1/3/01 +0100, you wrote:

>On Fri, Dec 15, 2000 at 02:11:42PM -0600, Timothee Besset wrote:
> >
> > I'm looking for a solution to handle binary objects in an easy to
> > manipulate file format. I like the chunk-based approach of XML and would
> > want something similar.
> >
> > To give an idea, I would like to do something similar to tar archives, but
> > benefit from the XML API (doing SAX parsing for streaming applications for
> > example). (and also benefit from all the processing tools that rely on XML)
> >
> > I know that it is possible to include binary data into an XML file by
> > encoding it like it's done for mail attachements. But I want to avoid the
> > overhead of having to convert back and forth to getter best performances.
> >
> > I also know that libxml supports gzipped streams, so my natural idea would
> > be to extend this mechanism and be able to store the binary objects
> "as-is"
> > in the "binary" XML file.
> >
> > Maybe there are projects that I don't know of which provide this
> binary-XML
> > feature already (under LGPL licensing preferably). Or maybe you don't
> think
> > this is the right way to go, or even you'd like to give me a few hints on
> > how to proceed..
>
> I think this is a packaging format problem. I have already suggested
>a format (in other forums), basically it's the following:
>
> - a ZIP file encapsulating a set of files
> - the first file is in an XML format and provides metadata
> (filename, URL, mime type, ...) for the content of the archive
> - the other elements in the archive can be either XML or binary
>
> binary blurbs *within* XML files don't fit well at all.
>I will probably add native support for this package format in
>a not too distant future version of libxml, I suggest you look at
>the discussion taking place in the OpenOffice XML devel list
> http://xml.openoffice.org/
>
>Daniel
>
>--
>Daniel Veillard | Red Hat Network http://redhat.com/products/network/
>daniel@veillard.com | libxml Gnome XML toolkit http://xmlsoft.org/
>http://veillard.com/ | Rpmfind RPM search engine http://rpmfind.net/
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