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Brief the EBNF notation in TOSCA Query Language.
| | | logical OR ( Example: b | c either b or c) |
| [...] | Square brackets represent an option. |
| (...) | Parentheses are used to group expressions.
The content must be used exactly once. |
| {...} |
Curly brackets represent an iteration. |
| '...' |
Marks a text which must be taken word-by-word (terminals). |
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