question about rb_sort_clb

[ExclusiveDY]

using version: libyang 3
origin xml: C is list, C-type is key, the type of C-type is enumeration : [XX, 1], [YY, 2]

<A xmlns='urn:ietf:params:xml:ns:yang:A'>
  <B>
	<C>
	  <C-type>XX</C-type>
	</C>
	<C>
	  <C-type>YY</C-type>
	</C>
  </C>
</A>

When I convert this XML into a libyang tree ,I found that the libyang tree became the following.

<A xmlns='urn:ietf:params:xml:ns:yang:A'>
  <B>
	<C>
	  <C-type>YY</C-type>
	</C>
	<C>
	  <C-type>XX</C-type>
	</C>
  </C>
</A>

I found that the reason for this behavior is that the lyplg_type_sort_enum function sorts the enumeration types from largest to smallest, while for the string type, its sorting function lyplg_type_compare_simple sorts from smallest to largest. For the boolean and decimal64 types, the sorting is also from smallest to largest.
Question:
1、I would like to know what considerations led to this difference?
2、I expect the libyang tree to maintain the original XML order. how should I do this?

Looking forward to your reply. Thanks.

[michalvasko]

lyplg_type_sort_enum function sorts the enumeration types from largest to smallest

Not true, it is sorted based on the enum value, the string name is ignored. All the types should be sorted in ascending order.

I expect the libyang tree to maintain the original XML order. how should I do this?

You must then define the list as ordered-by user.

[ExclusiveDY]

Not true, it is sorted based on the enum value, the string name is ignored. All the types should be sorted in ascending order.

The enumeration type in the example above is defined as follows, but it appears in descending order. Why is this?

  typedef Ctype {
    type enumeration {
      enum "XX" {
        value 1;
      }
      enum "YY" {
        value 2;
      }
  }

You must then define the list as ordered-by user.

Is there any interface I can set up? Or do I need to implement the sorting method myself?

[michalvasko]

Why is this?

Okay, I do not know what you are doing exactly. I have tested it myself, you can try it, too. The data are ordered in ascending order based on the enum value.

Is there any interface I can set up? Or do I need to implement the sorting method myself?

You can implement a type plugin for a specific typedef. In it you can define your own sorting callback and sort however you want. That is true for system-ordered lists. If you define a user-ordered list, it will always keep the same order of data that were received from the input.