[ ]
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Items (keywords or arguments) in square brackets [ ] are optional.
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...
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Preceding elements can appear repeatedly.
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[ x | y | ... ]
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Optional alternative items are grouped in square brackets and separated by vertical bars. One or none is selected.
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{ x | y | ... }
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Alternative items are grouped in braces and separated by vertical bars. One is selected.
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[x | y | ... ] [ ... ]
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Multiple parameters or no parameter can be selected. If multiple parameters are selected, separate them with spaces.
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[ x | y | ... ] [ ,... ]
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Multiple parameters or no parameter can be selected. If multiple parameters are selected, separate them with commas (,).
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{ x | y | ... } [ ... ]
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At least one parameter can be selected. If multiple parameters are selected, separate them with spaces.
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{ x | y | ... } [ ,... ]
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At least one parameter can be selected. If multiple parameters are selected, separate them with commas (,).
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