34.6. Simple Type Substitution
xsi:typeattribute. The default mapping of simple types to Java primitive types, however, does not fully support simple type substitution. The runtime can handle basic simple type substitution, but information is lost. The code generators can be customized to generate Java classes that facilitate lossless simple type substitution.
Default mapping and marshaling
xsi:typeattribute meets one of the following conditions:
- It specifies a primitive type that is compatible with the element's schema type.
- It specifies a type that derives by restriction from the element’s schema type.
- It specifies a complex type that derives by extension from the element’s schema type.
xsi:typeattribute. If the type substitution is from a complex type to a simple type, only the value directly related to the simple type is preserved. Any other elements and attributes added by extension are lost.
Supporting lossless type substitution
- Set the
true.This instructs the code generator to create Java value classes for all named simple types defined in the global scope.For more information see Section 38.3, “Generating Java Classes for Simple Types”.
- Add a
javaTypeelement to the
globalBindingscustomization element.This instructs the code generators to map all instances of an XML Schema primitive type to s specific class of object.For more information see Section 38.2, “Specifying the Java Class of an XML Schema Primitive”.
- Add a
baseTypecustomization element to the specific elements you want to customize.The
baseTypecustomization element allows you to specify the Java type generated to represent a property. To ensure the best compatibility for simple type substitution, use
java.lang.Objectas the base type.For more information see Section 38.6, “Specifying the Base Type of an Element or an Attribute”.