Cart
[Home] [By Thread] [By Date] [Recent Entries]
Hello,
substitution groups and type inheritance seem to provide similar
capabilities. What are differences? When should I use one
or the other?
in common:
both are substitution mechanisms
use instance of derived where base expected/use substitute
where head expected
the substitution is restricted to one to many
one base, multiple derived/one head, multiple substitutes
substitution is restricted to same or derived type in both cases
(if the type differs, to be able to use substitution groups
you must have defined a type hierarchy anyways!?)
both can be defined across namespaces
different:
in substitution groups you are working with elements, versus types
in type inheritance (not sure about implications of this).
substitution groups are based on global types + references in
local elements. This makes for ugly instance documents if using
unqualified locals.
(I searched the archives, but couldn't find a discussion on this.
If I missed something pl. send a URL)
Thanks,
Julio
|
