New features in version 0.17
============================

`README.new' (this) file has been renamed to `HISTORY'.

GRP parser
----------

New PortDef rule has been inserted into the parser. Alternate version
of this rule is:

PortDef:= .

This means that we can define ports in header section of the program
part using type of the port (`INPORT', `OUTPORT', `INOUTPORT') only
without definition of the port. If we use port definition, it can be
simplier because the rule of TypeList has been changed. New rule is:

TypeList:= .
TypeList:= TypeList PortDef.

(It is in header section of the program part.) This rule allows us to
define any port without type definition because the list of data types
of the port can be empty.

Remember that you can omit these informations from the GRP file
without any syntactical problem, but they are required for grp2c code
generator.

Support of graphical blocks is intruduced. `ProgParam' rule has been
removed and some of the rules has been changed. Changed rules are:

ProgItemType:= "SEQ".
ProgItemType:= "CAI".
ProgItemType:= "CAO".
ProgItemType:= "CAIALT".
ProgItemType:= "IFB".
ProgItemType:= "IFE".
ProgItemType:= "SWITCHB".
ProgItemType:= "SWITCHE".
ProgItemType:= "LOOPB".
ProgItemType:= "LOOPE".
ProgItemType:= "GRAPHIC".
ProgItemType:= "DUMMYB".
ProgItemType:= "DUMMYE".

ParamsOfProgItem:= ConnList PortParamList ItemsListOfGraph.

As you see, a new type of program item has been introduced:
GRAPHIC. This block is a collection of other program items. It has an
item collection (see README.data) which must be a complete program
item chain with DUMMYB and DUMMYE items. Other change is that order of
parameters of the block has been fixed. New rules have been used to
describe these parameters:

ConnList:= Connection.
ConnList:= ConnList Connection.

PortParamList:= .
PortParamList:= PortParamList PortParam.

ItemListOfGraph:= ProcPgroupList.

Connection list must not be empty but list of ports can be. Last kind
of the parameters are new. This parameter can be a complete (or empty,
of course) list of program items. It means that items can be
nested. Nesting levels are not restricted and items can be inserted
into any kind of the items, but parser stops with error an message if
it finds nested items in other type than GRAPHIC.

Mar 4, 1996.