We recently integrated a strict schema in our custom framework and found wrong values for attribute rend in the closer-element. It was 'within the line' separated by spaces not dashes as defined in our schema. The problem is, separation by white spaces indicates multiple different values for rend. I'm sure that's not intended. A colleague found the root of the value is the 'closer' ediarum author action. We changed it in our framework, but maybe you want to integrate it too.