Can XSD simple types be derived from complex types?

[Soren Kuula]

Looks like a silly question? I'm in doubt!

- the Recommendation does it (anyType / anySimple type)

- it's possible to restrict away all optional elements and attributes
from a mixed complex type. If doing that on a type where all elements
and attributes are optional, does that leave one with the equivalent of
anySimpleType, then?

Soren

[Soren Kuula]

Soren Kuula wrote:

Looks like a silly question? I'm in doubt!

- the Recommendation does it (anyType / anySimple type)

- it's possible to restrict away all optional elements and attributes
from a mixed complex type. If doing that on a type where all elements
and attributes are optional, does that leave one with the equivalent of
anySimpleType, then?

Soren

-- or is the answer: It's possible enough in the way I said, but XSD
doesn't provide for it syntactically?

Soren

[Henry S. Thompson]

Soren Kuula writes:

Looks like a silly question? I'm in doubt!

- the Recommendation does it (anyType / anySimple type)
That's special-cased.
- it's possible to restrict away all optional elements and attributes
from a mixed complex type. If doing that on a type where all elements
and attributes are optional, does that leave one with the equivalent
of anySimpleType, then?

Not really -- such a type defn would have untyped content, not quite
the same as anySimpleType -- _but_ you can derive a complex type defn
with simple content, e.g. xs:date, from an emptiable mixed complex
type defn.

ht
--
Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
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