By default, Interscript installs a special weaver called
'multiplexor' which delegates commands to zero, one,
or more weavers. This weaver also supports simplified list
definitions. Here's the example above, simplified.
@begin_list('keyed')
@item('bullet')
A bullet or similar character at the start of each item.
@item('numbered')
A number at the start of each item.
@item('keyed')
A key, or definition term, at the start of each item.
@end_list()