15 - Keywords

The following keyword have a meaning at in some specific SDL-RT symbols listed below:

Table 3: Keywords in symbols

keywords	concerned symbols
PRIO	Task definition Task creation Continuous signal
TO_NAME TO_ID TO_ENV VIA	Message output
FOREVER NO_WAIT	semaphore manipulation
>, <, >=, <=, !=, == true, false, else	decision branches
USE MESSAGE MESSAGE_LIST STACK	additional heading symbol

16 - Syntax

All SDL-RT names must be a combination of alphabetical characters, numerical characters, and underscores. No other symbols are allowed.

Examples:
myProcessName
my_procedure_name
block_1
_semaphoreName

17 - Naming convention

Since some SDL-RT concepts can be reached through their names (processes, semaphores) each name in the system must be unique. This will make the design more legible and ease the support of SDL-RT in a tool.
It is suggested to use the following convention for names:

• block names should start with 'b',
• process names should start with 'p',
• timer names should start with 't',
• semaphore names should start with 's',
• global variables should start with 'g'.

18 - Lexical rules

A subset of the BNF (Backus-Naur Form) is used in these pages :
<traditional English expression> as it says...
[<stuff>] stuff is optional
{<stuff>}+ stuff is present at least one or more times
{<stuff>}* stuff is present 0 or more times

19 - Glossary

ANSI	American National Standards Institute
BNF	Backus-Naur Form
ITU	International Telecommunication Union
MSC	Message Sequence Chart
OMG	Object Management Group
RTOS	Real Time Operating System
SDL	Specification and Description Language
SDL-RT	Specification and Description Language - Real Time
UML	Unified Modeling Language
XML	eXtensible Markup Language

http://www.sdl-rt.org info@sdl-rt.org