Every document needs to have an xml:id.
Every surface needs to have an xml:id.
Every graphic needs to have an xml:id.
Every graphic needs a reference to an image.
Every zone needs to have an xml:id.
Every zone needs an upper left x (@ulx) value.
Every zone needs an upper left y (@uly) value.
Every zone needs a lower right x (@lrx) value.
Every zone needs a lower right y (@lry) value.
The reference to the data element seems broken, as its local-name() doesn't match the @type of the zone.
Every mdiv needs an xml:id.
Every mdiv needs a label with a length of at least one character.
A measure needs an xml:id.
Every space-separated value in @facs must point to a zone of type measure.
Every space-separated value in @facs must point to a zone of type staff.
If there is a mRest child, no other elements are allowed.
If there is a multiRest child, no other elements are allowed.
In Edirom, music may not contain groups.