NAME

       mplist_key - Return the key of the first property in a property list.

SYNOPSIS

       MSymbol mplist_key (MPlist * plist)

DESCRIPTION

       Return the key of the first property in a property list. The mplist_key() function returns
       the key of the first property in property list plist.  If the length of plist is zero, it
       returns Mnil.

COPYRIGHT

       Copyright (C) 2001 Information-technology Promotion Agency (IPA)
       Copyright (C) 2001-2011 National Institute of Advanced Industrial Science and Technology
       (AIST)
       Permission is granted to copy, distribute and/or modify this document under the terms of
       the GNU Free Documentation License <http://www.gnu.org/licenses/fdl.html>.