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RE: Namespaces,W3C XML Schema (was Re: ANN: SAX FiltersforNamespaceProce

• From: Francis Norton <francis@r...>
• To: xml-dev <xml-dev@l...>
• Date: Thu, 23 Aug 2001 16:19:48 +0100

> > complexity than this). Using local types made schema design and
> > maintenance much simpler than if every element name in the schema had to
> > be uniquely typed. But it it also makes it harder for me to comprehend
> > correctly even the relatively small (1-2Kb) messages that we typcially
> > deal with.
> 
> Maybe you do not use attributes, but if you do, do you have problems
> comprehending them because typically they are not in a namespace? Why are
> local element types different?
> 
I do use attributes - the difference is simply complexity. An
attribute's type is determined by its context, which is always its
parent. Local elements can be layered all the way up to a single global
root element. If you have n layers of local elements above an element
whose type you are tying to determine, you have n possible determining
contexts, of which n-1 are themselves of indeterminate type. 

In other words attributes are self-evident, but  local elements require
either schema-aware tools, schema coding standards or possibly both.

Francis.

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