Identifying Multi-valued items

Rfc2425 has this to say about multi-valued items:

   Each attribute defined in the text/directory body MAY have multiple
   values, if allowed in the definition of the profile in which the
   attribute is used. The general rule for encoding multi-valued items
   is to simply create a new content line for each value (including the
   type name).

Can someone please tell me how I can figure out which items are single 
valued and which are multi-valued? 

Thanks,

--
Tony