case Type.PROCESSING_INSTRUCTION:
return SingletonIterator.makeIterator(new StringValue(stringValue));
case Type.TEXT:
case Type.DOCUMENT:
case Type.NAMESPACE:
return SingletonIterator.makeIterator(new UntypedAtomicValue(stringValue));
default:
if (typeAnnotation == -1 || typeAnnotation == StandardNames.XS_UNTYPED ||
typeAnnotation == StandardNames.XS_UNTYPED_ATOMIC) {
return SingletonIterator.makeIterator(new UntypedAtomicValue(stringValue));
} else {
SchemaType stype = config.getSchemaType(typeAnnotation);
if (stype == null) {
String typeName = config.getNamePool().getDisplayName(typeAnnotation);
throw new IllegalStateException("Unknown type annotation " +