Chiusano Joseph wrote:
><Quote1>
>Where AdhocQueryType is the base type for both SQLQueryType and
>FilterQueryType.
></Quote1>
>
>AND
>
><Quote2>
>so that there is a AdhocQueryType class that is extended by SQLQueryType
>and FilterQueryType classes. Either type of query may be abstractly
>represented as a AdhocQueryType.
></Quote2>
>
>Just to clarify - I think you're saying that AdhocQueryType is an
>abstract type, and SQLQueryType and FilterQueryType are derived from it?
>
Above is correct understanding of the proposal.
>If so, the following is not permitted:
>
><element name="Query" type="tns:AdhocQueryType" minOccurs="1">
>
>because an element cannot be declared as an abstract type in W3C Schema
>only as a type that is derived from an abstract type.
>
I believe that is not true. As far as I know, type substitution allows
an abstract base type to be used as the type for element definition. It
is like declaring a variable of base class type in Java to hold derived
class instances.
When you do an instance you specify (substitute) the precise type as
follows:
<Query xsi:type="SQLQuery">
....
</Query>
Am I missing something?
--
Regards,
Farrukh
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