<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?
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.
Joe
Farrukh Najmi wrote:
>
> Team,
>
> In new V3 schema we have consistently used type substitution instead of
> choice construct when defining XMl schema. Choice in the pinion of many
> is not very object oriented and implementation experience has shown that
> it complicates design.
>
> I would like to ask if any one has objections if we replace occurrences
> of <choice> in the schema with type substitution. Here is an example of
> how teh proposal effects the schema:
>
> Old Way
> --------
> In query.xsd the definition of AdhocQueryRequest looks like:
>
> <sequence>
> <element ref = "tns:ResponseOption" minOccurs="1" maxOccurs="1" />
> <choice minOccurs="1" maxOccurs="1">
> <element ref = "tns:FilterQuery"/>
> <element ref = "tns:SQLQuery"/>
> </choice>
> </sequence>
>
> New Way
> -------
> Above Old Way would look like this under the proposal:
>
> <sequence>
> <element ref = "tns:ResponseOption" minOccurs="1" maxOccurs="1" />
> <element name="Query" type="tns:AdhocQueryType" minOccurs="1" </sequence>
>
> Where AdhocQueryType is the base type for both SQLQueryType and
> FilterQueryType.
>
> Benefits
> ---------
> Now code can be written using Object oriented principals 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.
>
> Thanks for your input on this issue.
>
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