Markup spec/BNF/Fundamental elements

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  • Fundamental elements

These are the fundamental definitions of common data types. Terminals are case-sensitive.

<character>             ::= <whitespace-char> | <non-whitespace-char> | <html-entity> 

<html-entity>           ::= "&" <html-entity-chars> ";"
                          | "&#" <decimal-number> ";"
                          | "&#x" <hex-number> ";"						   
<html-entity-chars>     ::= <html-entity-char> [<html-entity-chars>]
<html-entity-char>      ::= <ucase-letter> | <lcase-letter> | <decimal-digit>

<whitespace>            ::= <whitespace-char> [<whitespace>] | EOF
<newlines>              ::= <newline> [<newlines>]
<space-tabs>            ::= <space-tab> [<space-tabs>]

<whitespace-char>       ::= <space-tab> | <newline>

<space-tab>             ::= <space> | TAB
<spaces>                ::= <space> [<spaces>]
<space>                 ::= " "

<newline>               ::= CR LF | LF CR | CR | LF
<BOL>                   ::= <newline> | BOF
<EOL>                   ::= <newline> | EOF

<non-whitespace-char>   ::= <letter> | <decimal-digit> | <symbol>
<letter>                ::= <ucase-letter> | <lcase-letter>
<ucase-letter>          ::= "A" | "B" | ... | "Y" | "Z"
<lcase-letter>          ::= "a" | "b" | ... | "y" | "z"
<symbol>                ::= <html-unsafe-symbol> | <underscore> | "." | "," | ...
<html-unsafe-symbol>    ::= "<" | ">" | "&"
<underscore>            ::= "_"

<decimal-number>        ::= <decimal-digit> [<decimal-number>]
<decimal-digit>         ::= "0" | "1" | ... | "8" | "9"

<hex-number>            ::= <hex-digit> [<hex-number>]
<hex-digit>             ::= <decimal-digit> 
                            | "A" | "B" | "C" | "D" | "E" | "F" 
                            | "a" | "b" | "c" | "d" | "e" | "f"

Transformations

• Terminals in <html-unsafe-symbol> will, in some situations, need to be converted to valid <html-entity> symbols. When this is required, the transformation is as follows:
  • < becomes &lt;
  • > becomes &gt;
  • & becomes &amp;