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Subject: Re: [regrep] [XML Schema issue] Replace choice with type substitution
Sorry for my confusion (I just brushed up on this technique in my handy Wrox "Professional XML Schemas" book, as I haven't used it for some time). Sounds good to me. Thanks also Nikola for the additional verification. 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. > > ---------------------------------------------------------------- > To subscribe or unsubscribe from this elist use the subscription > manager: <http://lists.oasis-open.org/ob/adm.pl>
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