Hi all,
I've a general question concerning polymorphism and SDO.
Suppose I have a type A that contains a link "b" of type B. There also
exists a subtype "SpecialB" which extends B.
I interpret this link to be a polymorphic link, i.e. instances of this
link should be of type B or of a subtype of B.
This works fine when using the DataObject API (e.g. using the method
DataObject.createDataObject(Property property, Type type)).
However I don't understand how this is mapped into XML/XSD.
If I generate an XSD for type A, how do I express that the link 'b' is
polymorph?
A straigtforward approach like
<xsd:complexType name="A">
<xsd:sequence>
<xsd:element name="b" type="B" maxOccurs="1"
minOccurs="0"></xsd:element>
...
...
states that the type of B should be exactly 'B' (at least according to my
incomplete XML knowledge :-).
On the instance level,
<a><b>...</b></a>
is an xml piece for an object of type A with a link to some b. How would
this look like in case the link is to a SpecialB instance?
So, my question is, how do polymorphic links work in an xml context?
I hope this is clear.
Bert
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