XmlElement not allowed at root

[jezell]

yjs allows an XmlElement at the root of the document, pycrdt blows up when you try to do this and tells you you can only put an XmlFragment. But XmlFragments don't support attributes, so certain documents created with yjs are not possible to properly use with pycrdt.

[davidbrochart]

First thing is to check if it's possible with Yrs.