docs: String[] getInterfaces(XsdElement element, String apiName) {
          String[] attributeGroupInterfacesArr =  getAttributeGroupInterfaces(element);
          String[] elementGroupInterfacesArr =  getElementInterfaces(element, apiName);
          String[] hierarchyInterfacesArr = getHierarchyInterfaces(element, apiName);
  
          return ArrayUtils.addAll(ArrayUtils.addAll(attributeGroupInterfacesArr, elementGroupInterfacesArr), hierarchyInterfacesArr);
      }