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Basic Specifications with Subsorts

SIG-DECL        ::=   ... | SUBSORT-DECL
SUBSORT-DECL    ::=   EMBEDDING-DECL | ISO-DECL
EMBEDDING-DECL  ::=   embedding-decl SORT-LAYER+
SORT-LAYER      ::=   sort-layer SORT+
ISO-DECL        ::=   SORT-LAYER

BASIC-ITEM      ::=   ... | PRED-SORT-DEFN
PRED-SORT-DEFN  ::=   pred-sort-defn SORT VAR SORT FORMULA

ATOM            ::=   ... | MEMBERSHIP
MEMBERSHIP      ::=   membership TERM SORT
TERM            ::=   ... | CAST
CAST            ::=   cast TERM SORT
CoFI Tentative Document: LanguageSummary --Version 0.95-- March 6, 1997.
Comments to cofi-language@brics.dk