In the version of EBNF that became the ECMA and ISO standard, the following changes were made

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became the extended production synmbol

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commas were used between items on the right side of productions

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angle brackets to delimit non-terminals were changed to quotes

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= became the production symbol

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angle brackets had their use changed to delimiting terminals instead one non-terminals

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angle brackets to delimit non-terminals were eliminated altogether

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all literals had to be quoted

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