Metadata elements should be repeatable

[regisrob]

When you have several metadata elements with the same label (e.g. multiple "Author"), only the last one is displayed in metadataView.

[azaroth42]

+1
A workaround would be to have a list for the value:

  {"label": "Author", "value": ["Froissart", "Jehan le Bel", "anonymous chronicler A"]}

[regisrob]

Yes it works with a list. Just need a quick (and dirty) workaround in $.stringifyObject https://github.com/IIIF/mirador/blob/master/js/src/mirador.js#L207 to remove the brackets and do some basic formatting (e.g. an html list)