JAXB: How can derived object be returned as XML element of base type?

If so, you don't have to worry about that, when you do.

I've got where my misunderstood was. It is not neccessary to define 'xsi:type' explicitly in web-service responce, because one is described by WSDL. When we return derived class, the type is neccessary because client should know how it can unmarshall instance.

According to this the using of @XmlTransient annotation on derived type is the correct way if we want always return exactly instance of parent class.

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