[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message]

Re: SAX/C++: C++-specific design principles

• From: Daniel Veillard <Daniel.Veillard@w...>
• To: David Megginson <david@m...>
• Date: Fri, 3 Dec 1999 08:15:21 -0500

On Thu, Dec 02, 1999 at 04:32:36PM -0500, David Megginson wrote:
> Here are the principles that I applied to creating my first draft
> SAX/C++ interface:

  I'm afraid I won't be able to provide this interface in libxml
(the Gnome XML library http://xmlsoft.org/) due to the focus on C++,
though a C++ wrapper on top should be able to provide it.


> 2. Pointers never change ownership -- if a Parser (for example) wants
>    to own an InputSource, it needs to make its own copy.  The app has
>    to free everything that it allocates, and the SAX driver, likewise.

  Very good idea,

> 4. Hold my nose and use UTF-8 rather than UTF-16, for compatibility
>    with most existing C++ code.

  Like James pointed out it's hard to segregate a class of users.
UTF-8 compacteness will be appreciated by people wanting low memory
overhead when building transaction processing. UTF-16 will simplify
interfacing to DOM or using XML in UI oriented apps.

> 5. Use char * rather than string, to avoid forcing a lot of allocation 
>    overhead on the SAX driver.

I did opt for the simple approach having an xmlChar type used everywhere
except non XML content (filenames, errors messages ...). Having it 8 or
16 bits should be a compile-time (or run-time but that's more risky)
option.

Daniel

-- 
Daniel.Veillard@w... | W3C, INRIA Rhone-Alpes  | Today's Bookmarks :
Tel : +33 476 615 257  | 655, avenue de l'Europe | Linux XML libxml WWW
Fax : +33 476 615 207  | 38330 Montbonnot FRANCE | Gnome rpm2html rpmfind
 http://www.w3.org/People/all#veillard%40w3.org  | RPM badminton Kaffe

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

• Follow-Ups:
  • Re: SAX/C++: C++-specific design principles
    • From: David Megginson <david@m...>

• References:
  • SAX/C++: C++-specific design principles
    • From: David Megginson <david@m...>

• Prev by Date: Re: Content or Metadata?
• Next by Date: parser asynch input (Was: SAX/C++: First interface draft)
• Previous by thread: Re: SAX/C++: C++-specific design principles
• Next by thread: Re: SAX/C++: C++-specific design principles
• Index(es):
  • Date
  • Thread