[Playlist] Schema files and element order

[Sebastian Pipping]

Sebastian Pipping wrote:
> I agree. I think we should
>  * leave the old XSD (0.2, which allowed to little) online
>    and mark it deprecated
>  * update the Relax NG file to the new one (0.5) if it fully passes
>    the current testsuite. I will have to check this.

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I just did this. The website should be updated
in about 45 minutes.

@Matthias
I hope you are okay with this. I tried to explain
why the XSD schema is deprecated on the website
so people see it's not your fault but XSD's.



Sebastian