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

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From: Timothee Besset (timo@qeradiant.com)
Date: Thu Jan 04 2001 - 10:41:04 EST

How well does the zip approach allow file modification? Let's say I end up
with a zip file that's 300Mb, in which I randomly add and remove chunks (of
the size of an average file, say 100kb)? I understand this zip format would
be fine for reading, but I'm a bit worried about writing performances :-)

TTimo

At 11:31 AM 1/4/01 +0100, you wrote:

>On Thu, Jan 04, 2001 at 09:59:47AM +0100, Peter Jacobi wrote:
> >
> > Hi Daniel, All,
> >
> > > 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
> >
> > Are you suggesting 'the' ZIP format or do you mean any generic packed
> > archive format? If the former is the case, what's the rationale for
> > choosing ZIP over TAR/GZIP?
>
> because one can seek in a ZIP archive
> because it's basically Jar (Java format) but with an XML metadata header
> because tar standard (POSIX IIRC) and GNU implementation are subtly
> different
>
> > And to add another suggestion: The multiple 'forks' (XML, Binary) should
> > be virtualized in some kind, to a) exploit file systems who can provide
> > multiple forks per file natively (NTFS) b) use files withing a directory,
> > c) use MIME multipart, beside the d) the ZIP (or tar/gzip) implementation.
>
> I beg to differ, the problem with such an approach is that you loose
>the portability of an archive, factor which is driving me to add it. I'm
>not interested in this N ways to do packaging, I want one and have it
>work everywhere. Packing multiple entities in a single file using ZIP
>is a good interchange format, that's why I want to add it.
>Standardizing the metadata description is important too.
>
>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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