Add support for MusicXML files

[Phloks]

What file type
.mxl .musicxml

What application is using it
LilyPond, MuseScore

Motivation
It would be really nice beeing able to open those kind of files with the viewer app.

Since the trend is going to pro-only for online sheet music communities (MuseScore.com) it would be cool to have free alternative.

[skjnldsv]

Hey! :)
Please provide a sample file.
What are those files doing? What are they used for?

[Spartachetto]

Looking at https://en.m.wikipedia.org/wiki/MusicXML I learned that it is an XML-based file format for representing Western musical notation.
It seems to be free to use

[skjnldsv]

I guess we can :)
WOndering if it wouldn't be better as a plugin though? @juliushaertl @ChristophWurst what do you think? Shall we add support for other files here too?

Could be easier to maintain?

[juliusknorr]

Yes, that is something for a separate app I'd say. I already looked for libraries that support that some while ago and https://github.com/opensheetmusicdisplay/opensheetmusicdisplay looked pretty promising. To bad that MuseScore itself has a nice web player that is unfortunately not free software

[Spartachetto]

I am sorry: I am not following the guidelines and you'll receive an annoying notification...
But guys, You're GREAT!!!!

[Spartachetto]

I happened to reread this issue and I double checked the OpenSheetMusicDisplay repository and I discovered that they will have Soon: Audio Playback (work in progress, early access build available for sponsors)

[bneumann]

I was just googleing "nextcloud musescore viewer" when I found this issue. I happen to be a contributor to OpenSheetMusicDisplay so I know that library pretty well (yes we have audio playback now :) ). If somebody here has experience with viewer imlementations for nextcloud we could start some joint venture and hack something together. Anyone?

[alex-bene]

Not a developer of any of the mentioned platforms, but it would be amazing if we managed to piece something together for MusicXML support on Nextcloud! Let me know if I can help with this.

[bneumann]

Just to let you know, I started some work on it the last weeks. I am not sure of we should integrate it in this viewer here or better have a standalone music XML viewer.
any developer from Nextcloud or this viewer got an opinion?