else:
try:
universe.contents[element].set(facet, value)
+ except PermissionError:
+ message = ('The "%s" element is kept in read-only file '
+ '"%s" and cannot be altered.' %
+ (element, universe.contents[
+ element].origin.filename))
except ValueError:
message = ('Value "%s" of type "%s" cannot be coerced '
'to the correct datatype for facet "%s".' %