DTD Question: Attributes vs Elements
Marcelo Cantos
marcelo at mds.rmit.edu.au
Sun Mar 21 02:52:38 GMT 1999
On Sat, Mar 20, 1999 at 12:46:03PM +0100, Jarle Stabell wrote:
> Tim Bray wrote:
> > Attributes differ in that
> > - they get white-space-normalized
> > - their order is not significant
> > - you can't have more than 1 with the same name on an element
> > - they can't contain any internal structure
>
> They also don't "pollute" the namespace.
This could probably be formalised into three categories: data that
_must_ be stored in an attribute, data that _cannot_ be stored in an
attribute, and everything else. For example:
MUST: * Enumerated values (status can be active, inactive or
closed).
CANNOT: * Structured information
* White space matters
* order is significant
* More than one item for any one name
OTHER: * General string values
* URL's
Maybe the wisdom of experience could subdivide OTHER into SHOULD,
SHOULDN'T and DOESN'T MATTER (which could address the namespace
pollution issue).
Cheers,
Marcelo
--
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