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RE: attribute order (RE: Syntax Sugar and XML information models)

• From: Matt Sergeant <matt@s...>
• To: Tim Bray <tbray@t...>
• Date: Fri, 30 Mar 2001 23:03:31 +0100 (BST)

On Fri, 30 Mar 2001, Tim Bray wrote:

> At 08:26 AM 30/03/01 -0500, Simon St.Laurent wrote:
> >Is there some kind of processing advantage for _parsers_ (not applications) 
> >to report attribute values in any sequence other than their original sequence?
> 
> Only instance I can think of is in perl, in one of the interfaces
> through XML::Parser to expat, you can arrange to get a callback
> for each start tag where the attributes are passed in as a hash
> keyed by name in the obvious way.  So the order isn't changed,
> but it's effectively lost. -Tim

Not true actually, XML::Parser passes them through as an array, it's just
that assigning that to a hash loses the order. Try:

sub parse_start {
  my ($e, $tag, @attribs) = @_;
  print "Tag: $tag\n";
  while (@attribs) {
    my ($key, $value) = splice(@attribs, 0, 2);
    print "Attrib: $key=$value\n";
  }
}

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<Matt/>

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  • RE: attribute order (RE: Syntax Sugar and XML information models)
    • From: Tim Bray <tbray@t...>

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