How to use

getBaseType

method

in

org.eclipse.xsd.XSDSimpleTypeDefinition

  @Override
  public AttributeType buildSuper() {
    XSDTypeDefinition baseType = xsdType.getBaseType();
    if (baseType != null && baseType.getName() != null && !baseType.equals(xsdType)) {
      return createType(baseType, Integer.MAX_VALUE);
    } else {
      return null;
    }
  }
};

protected AttributeType createType( XSDSimpleTypeDefinition xsdType, int depth ) {
  if (types.containsKey(xsdType)) {
    return (AttributeType) types.get(xsdType);
  }
  //import?
  if (!xsdType.getTargetNamespace().equals(schema.getTargetNamespace())) {
    return (AttributeType) findType(xsdType);
  }
  //first build super type
  AttributeType superType = null;
  XSDTypeDefinition baseType = xsdType.getBaseType();
  if ((baseType != null) && !baseType.equals(xsdType)) {
    if (baseType.getName() != null) {
      //ignore unamed types
      //superType = createType((XSDSimpleTypeDefinition)baseType);
      superType = createType(baseType, depth+1);
      assert superType != null;
    }
  }
  //TODO: actually derive valus from type
  AttributeType gtType = factory.createAttributeType(
    name(xsdType), Object.class, false, false, Collections.EMPTY_LIST, 
    superType, null
  );
  types.put(xsdType, gtType);
  return gtType;
}

private void fillTypesCombo()
{
 typesCombo.removeAll();
 
 IEditorPart editor = getActiveEditor();
 ComponentReferenceEditManager manager = (ComponentReferenceEditManager)editor.getAdapter(XSDTypeReferenceEditManager.class);    
 ComponentSpecification[] items = manager.getQuickPicks();
 
 typesCombo.add(org.eclipse.wst.xsd.ui.internal.adt.editor.Messages._UI_ACTION_BROWSE);
 typesCombo.add(org.eclipse.wst.xsd.ui.internal.editor.Messages._UI_ACTION_NEW);
 
 for (int i = 0; i < items.length; i++)
 {
  typesCombo.add(items[i].getName());
 }
 // Add the current Type of this attribute if needed
 XSDSimpleTypeDefinition simpleType = (XSDSimpleTypeDefinition) input;
 XSDTypeDefinition baseType = simpleType.getBaseType();
 if (baseType != null && baseType.getQName() != null)
 {
  String currentTypeName = baseType.getQName(xsdSchema); //no prefix
  ComponentSpecification ret = getComponentSpecFromQuickPickForValue(currentTypeName,manager);
  if (ret == null && currentTypeName != null) //not in quickPick
  {
   typesCombo.add(currentTypeName);
  }
 }
}

 handleMultiplicity(xsdSchema, eStructuralFeature, xsdSimpleTypeDefinition, baseType);
xsdComplexTypeDefinition.setBaseTypeDefinition(xsdSimpleTypeDefinition.getBaseType());
xsdComplexTypeDefinition.setDerivationMethod(xsdSimpleTypeDefinition.getContents().isEmpty() ? XSDDerivationMethod.EXTENSION_LITERAL : XSDDerivationMethod.RESTRICTION_LITERAL);
xsdComplexTypeDefinition.setContent(xsdSimpleTypeDefinition);

 handleMultiplicity(xsdSchema, eStructuralFeature, xsdSimpleTypeDefinition, baseType);
xsdComplexTypeDefinition.setBaseTypeDefinition(xsdSimpleTypeDefinition.getBaseType());
xsdComplexTypeDefinition.setDerivationMethod(xsdSimpleTypeDefinition.getContents().isEmpty() ? XSDDerivationMethod.EXTENSION_LITERAL : XSDDerivationMethod.RESTRICTION_LITERAL);
xsdComplexTypeDefinition.setContent(xsdSimpleTypeDefinition);