From Tapestries MUCK

concat

{concat:listname}
{concat:listname,obj}

Returns a string, containing the concatenated lines of a property based list. It concatenates the list semi-intelligently, putting a single space between lines normally, and two spaces between lines when the previous one ended with a period, exclamation mark, or question mark.

A property based list is a series of properties that are consecutively numbered. The server understands several different formats, and can also read in property lists in either the propnameX format, or the propname#/X format. It does NOT evaluate the contents of the list for embedded MPI.

If no obj argument is supplied, then it looks for the list somewhere down the environment from the trigger object. Otherwise, it looks for the list down the environment from the given object.