Overview › Reading Syntax Diagrams
Reading Syntax Diagrams
Syntax diagrams illustrate the format of statements and some basic language elements. Read syntax diagrams from left to right and top to bottom.
Syntax diagrams use the following terminology, symbols, and concepts:
- Keywords appear in uppercase letters, for example, COMMAND or PARM. Enter these words exactly as shown.
- Variables appear in italicized lowercase letters, for example, variable.
- Required keywords and variables appear on a main line.
- Optional keywords and variables appear below a main line.
- Default keywords and variables appear above a main line.
- Double arrowheads pointing to the right indicate the beginning of a statement.
- Double arrowheads pointing to each other indicate the end of a statement.
- Single arrowheads pointing to the right indicate a portion of a statement, or that the statement continues in another diagram.
- Punctuation marks or arithmetic symbols that are shown with a keyword or variable must be entered as part of the statement or command. Punctuation marks and arithmetic symbols can include the following:
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,
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comma
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>
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greater than symbol
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.
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period
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<-
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less than symbol
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(
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open parenthesis
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=
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equal sign
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)
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close parenthesis
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¬
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not sign
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+
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addition
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-
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subtraction
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*
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multiplication
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/
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division
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