[Date Prev] | [Thread Prev] | [Thread Next] | [Date Next] -- [Date Index] | [Thread Index] | [List Home]
Subject: Re: [regrep] [XML Schema issue] Replace choice with type substitution
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 ---------------------------------------------------------------- To subscribe or unsubscribe from this elist use the subscription manager: <http://lists.oasis-open.org/ob/adm.pl>
[Date Prev] | [Thread Prev] | [Thread Next] | [Date Next] -- [Date Index] | [Thread Index] | [List Home]