Subfolder support for metalink about aria2

[maliayas]

I've done some reading on Metalink 3 and Metalink 4 specs to help developers and also start a discussion.

From Metalink 3 spec (4 is also the same):

<file> MUST have the attribute name containing the file name, as in:
<file name="example.ext">.

Firstly, it turns out that my request slightly contraditcs with both specs because both specs require name attribute for <file>. That means a metalink file always has to define target file name, it just cannot leave it to metalink application to infer from the content-disposition header.

In fact, that was a surprise to me, in terms of UX. Just like my web browser can download any URL and automatically decide the file name, I'd expect the same from a metalink application.

Besides that, I'd like to ask developers about extending Metalink spec in this regard, which I believe would be more intuitive and also still backwards compatible with existing specs.

What do you think?