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

RE: Fast text output from SAX?

• To: "'Elliotte Rusty Harold'" <elharo@m...>,"'Jeff Rafter'" <lists@j...>
• Subject: RE: Fast text output from SAX?
• From: "Michael Kay" <michael.h.kay@n...>
• Date: Thu, 15 Apr 2004 16:48:22 +0100
• Cc: "'Stephen D. Williams'" <sdw@l...>,"'XML DEV'" <xml-dev@l...>
• In-reply-to: <p06010202bca455bb11cc@[192.168.254.88]>
• Thread-index: AcQi/oHsLFzNVirUQGSghoZ03Y26LAAAS/CA

> >Agreed, well-formednes must be checked. But surely it 
> doesn't need to be
> >checked every time a document is parsed (if it is 
> unchanged).
> 
> How do you know no other process or person has modified the field in 
> the mean time?
> 

Why not define a standardized checksum, that can be included in the XML
declaration, e.g.

<?xml version="1.2" checksum="08bd37f1"?>

with the rules:

(a) nothing other than a parser that checks well-formedness may generate a
checksum

(b) at user option, a parser may skip some or all well-formedness checks if
a checksum is present and correct?

A user who doesn't trust the originator of the XML should still check for
well-formedness.

I personally don't think that XML parsing is that time-critical to most
applications, but I can imagine that there are applications where avoiding
the cost of repeatedly checking (for example) that every name is made up of
valid characters would be beneficial.

Michael Kay

• Follow-Ups:
  • Re: Fast text output from SAX?
    • From: Bjoern Hoehrmann <derhoermi@g...>
  • RE: Fast text output from SAX?
    • From: Elliotte Rusty Harold <elharo@m...>
  • RE: Fast text output from SAX?
    • From: Elliotte Rusty Harold <elharo@m...>

• References:
  • Re: Fast text output from SAX?
    • From: Elliotte Rusty Harold <elharo@m...>

• Prev by Date: Re: Fast text output from SAX?
• Next by Date: RE: Fast text output from SAX?
• Previous by thread: Re: Fast text output from SAX?
• Next by thread: RE: Fast text output from SAX?
• Index(es):
  • Date
  • Thread