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BNF rules used to specify substitution/refinement/structuring: data-item ::= data-structure person ::= name + address name ::= first_name + last_name.

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Presentation on theme: "BNF rules used to specify substitution/refinement/structuring: data-item ::= data-structure person ::= name + address name ::= first_name + last_name."— Presentation transcript:

1 BNF rules used to specify substitution/refinement/structuring: data-item ::= data-structure person ::= name + address name ::= first_name + last_name

2 BNF meta-symbols used to describe structure: ::= is defined as + sequence [...|...|...] exclusive alternatives {... } iteration (>=1 repetitions) (... ) option

3 Patient Data Record - BNF PDR ::= p_id + p_name + c_val + status + {d_val} p_name ::= first_name + last_name c_val ::= heart_rate + temp + ( blood_pressure ) status ::= [ “critical” | “non-critical” ] d_val ::= d_heart + d_temp + ( d_blood ) formal structure specification:

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