docs: static String getFullJavaType(XsdAttribute attribute){
          List<XsdRestriction> restrictions = getAttributeRestrictions(attribute);
          String javaType = xsdFullTypesToJava.getOrDefault(attribute.getType(), null);
  
          if (javaType == null){
              if (!restrictions.isEmpty()){
                  return xsdFullTypesToJava.getOrDefault(restrictions.get(0).getBase(), JAVA_OBJECT_DESC);
              }
  
              return JAVA_OBJECT_DESC;
          }
  
          return javaType;
      }