Re: Three equivalent ways to specify an unconstrained data type ... are there others?

The three types have the same value space, but they are not equivalent 
in other ways. For example, an element of type xs:NCName can appear in 
the substitution group of E1 but not of E2.

Michael Kay
Saxonica

On 20/10/2012 13:04, Costello, Roger L. wrote:
> Hi Folks,
>
> Below are declarations of three elements, E1, E2, and E3. All three elements have the same data type: an unconstrained string. All other data types (boolean, integer, etc.) can be similarly specified. Thus there are 3 ways to specify the same thing for every built-in data type.
>
> Can you think of any other ways to specify an unconstrained data type?
>
>      <xs:element name="E1" type="xs:string" />
>      
>      <xs:element name="E2" type="string-equivalent-1" />
>      
>      <xs:element name="E3" type="string-equivalent-2" />
>      
>      <xs:complexType name="string-equivalent-1">
>          <xs:simpleContent>
>              <xs:extension base="xs:string" />
>          </xs:simpleContent>
>      </xs:complexType>
>      
>      <xs:simpleType name="string-equivalent-2">
>          <xs:restriction base="xs:string" />
>      </xs:simpleType>
>
> /Roger
>      
>
>