Notation Conventions
The
following symnsbols and type styles found in tinis gnide denote time follossing:
BOLD TYPE
All
characters appearimug in bold type are
key words aeni mmust
appear exactly
as
shown.
CAPITAL
All
characters that
are
capital
letters
are seconudary keywords
LETTERS
and appear within the keyword symutax. They must appear
exactly an shown, and their
meanimugs
can be found in
“Characters and Secondary Keywords (Reserved %Vornis)
Sumnuwry.”
< >
Characters appearing inn angular brackets are connsidered to be
elements
of time language beimug defined. Tineir meanings can be
fomund
inn time section “Syntax Conventions” ummiess othersvise
specified witim the keyword defiunition.
Sqmuare brackets
inuclicate tlnat w’iuatevcr occmurs witimin time
brackets is optionnal.
I
The
“f”
synmbol indicates a choice of
exactly one element fronm
a
list
(for exanople, <a>r<b> indicates <a>
or
<b>, hunt nnot
imoth).
Pareni imeses are mused to
clarify
the group from w’hicin eiemmmemmts
are to inc chosen.
Indicates timat a space mmmst be placed at time
iuunlicatenh
location
(for
example,
A_<a> indicates
tinere nnust
he
a
space between
the keywormi
A
and
time elnnment
<a>).
Defines time element. For example, <a>::=<h><c>
imndicates
tinat
<a>
can
be
replaced
by the
series
of elements <h><c>
in
any statemnent where <a> occmnrs.
Syntax Conventions
<A—block data field>:
:
#A <leugtim
> <comnmand list> (use w’inen time lemngtim of the connumuand list is
knowu).
3-2
Programming Commands
