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Managing Multimedia and Unstructured Data in the Oracle Database by Marcelle Kratochvil

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EBNF Syntax

The following section covers the Extended Backus–Naur Form (EBNF) of the railroad diagrams. This syntax can be used in any Backus–Naur Form (BNF) parser, enabling the interpretation of the circa date entered.

Circa = Date [ "-" | "to" | "and" | "or" Date ] [ "[" Earliest_date [ "-" | "to" ] Latest_date "]" ]. Date = [Pre_keyword] [Period] Date_value [Period] [Post_keyword]. Pre_keyword = "about" | "before" | "after" | "probably" | "c." | "ca." | "cca." | "circa" | "late". Period = "ad" | "bc" | "a.d." | "b.c." | "bce" | "ce". Post_keyword = "years ago". Earliest_date = Date_value. Latest_date = Date_value. Recent_period = "medieval" | "prehistoric" | "antediluvian". Time_period = "neogene" | "paleogene" | "cretaceous" | "jurassic" ...

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