These class-based attributes use data.STAFFREL.basic
att.cleffing.log/@clef.dis.placeRecords the direction of octave displacement to be applied to the clef.
att.fermataPresent/@fermataIndicates the attachment of a fermata to this element. If visual information about
the
fermata needs to be recorded, then a fermata [not available in this MEI customization] element should be
employed instead.