3 del = element del { del.attlist, Inline.model }
4 del.attlist = Edit.attrib
5 ins = element ins { ins.attlist, Inline.model }
6 ins.attlist = Edit.attrib
8 attribute cite { URI.datatype }?,
9 attribute datetime { Datetime.datatype }?
10 Edit.class = del | ins
11 Inline.class |= Edit.class
12 Block.class |= Edit.class