Exchange/RJE Manual

Notation Conventions
104698 Tandem Computers Incorporated xvii
The following list summarizes the conventions for syntax presentation in this manual.
Notation Meaning
UPPERCASE LETTERS Uppercase letters represent keywords and reserved words; enter these
items exactly as shown.
lowercase italic letters Lowercase italic letters represent variable items that you supply.
Brackets [ ] Brackets enclose optional syntax items. A group of vertically aligned
items enclosed in brackets represents a list of selections from which you
can choose one or none.
Braces { } Braces enclose required syntax items. A group of vertically aligned
items enclosed in braces represents a list of selections from which you
must choose one.
Vertical line | A vertical line separates alternative syntax items in a horizontal list.
Such a list, enclosed in either brackets or braces, is an alternative to a
vertical list for presenting selections.
Ellipsis ... An ellipsis immediately following a pair of brackets or braces indicates
that you can repeat the enclosed syntax items any number of times.
Percent sign % A percent sign precedes a number that is not in decimal notation:
% indicates octal notation.
%B indicates binary notation.
%H indicates hexadecimal notation.
%D after a hexadecimal value denotes double precision.
%F after a hexadecimal value denotes a fixed numeric constant.
Spaces If a space separates two items, that space is required. If one of the
items is a punctuation symbol, such as a parenthesis or a comma,
spaces are optional.
Punctuation Parentheses, commas, semicolons, and other symbols not described
above must be entered precisely as shown. Quotation marks around
any symbol indicate that it is not a syntax descriptor but a required
character, and you must enter it as shown.
In addition to the above syntax presentation, this manual uses the following
convention to describe the bits in a word for a specified parameter:
Notation Meaning
parameter [x] Indicates word x in the specified parameter. Words in a parameter are
numbered left to right, starting from 0.
parameter [x:y] A colon indicates a range: words x through y , inclusive.
.<x> Indicates bit x in a given word. x is from 0 through 7 for the left-hand
byte in a word, and from 8 through 15 for the right-hand byte in a word.
.<x:y> A colon indicates a range: bits x through y , inclusive.
For example, parameter [4].<1:3> refers to bits 1 through 3 of word 4 in the
parameter.