[<Q_IRIref>]   ::= '<' ([^> ])* '>' /* An IRI reference : RFC 3987 */
<QNAME_NS>   ::= <NCNAME_PREFIX>? ':'
<QNAME>      ::= <NCNAME_PREFIX>? ':' <NCNAME>?
<BNODE_LABEL>  ::= '_:' <NCNAME>
<VAR1>       ::= '?' <VARNAME>
<VAR2>       ::= '$' <VARNAME>
//<LANGTAG>    ::= AT A2Z+ ('-' (A2ZN)+)*
<LANGTAG>    ::= '@' [a-zA-Z]+ ('-' [a-zA-Z0-9]+)*
// <#A2Z>       ::= [a-zA-Z]
// <#A2ZN>      ::= [a-zA-Z0-9]

<INTEGER>	::= [0-9]+
<DECIMAL>   ::= ( [0-9]+ '.' [0-9]* | '.' [0-9]+ )

<FLOATING_POINT> ::= [0-9]+ '.' [0-9]* <EXPONENT>? | '.' ([0-9])+ <EXPONENT>? | ([0-9])+ <EXPONENT>

// Required exponent
//<FLOATING_POINT> ::= [0-9]+ '.' [0-9]* <EXPONENT> | '.' ([0-9])+ <EXPONENT> | ([0-9])+ <EXPONENT>

<#EXPONENT>  ::= [eE] [+-]? [0-9]+

<STRING_LITERAL1> ::= "'" ( ([^'\\\n\r]) | ('\\' [^\n\r]) )* "'"
<STRING_LITERAL2> ::= '"' ( ([^"\\\n\r]) | ('\\' [^\n\r]) )* '"'


<STRING_LITERAL_LONG1> ::= '"""' ( [^"\\] | ("\\"  [^\n\r]) | ('"' [^"]) | ('""' [^"]) )* '"""'
<STRING_LITERAL_LONG2> ::= "'''" ( [^'\\] | ("\\"  [^\n\r]) | ("'" [^']) | ("''" [^']) )* "'''"

// The print value is the whitespace trimmed value after ::=

[<KW_A>]       ::= 'a'

[<BASE>]       ::= 'BASE'
[<PREFIX>]     ::= 'PREFIX'
[<SELECT>]     ::= 'SELECT'
[<DESCRIBE>]   ::= 'DESCRIBE'
[<CONSTRUCT>]  ::= 'CONSTRUCT'
[<ASK>]        ::= 'ASK'
[<DISTINCT>]   ::= 'DISTINCT'
[<WHERE>]      ::= 'WHERE'

[<LIMIT>]      ::= 'LIMIT'
[<OFFSET>]     ::= 'OFFSET'
[<ORDER>]      ::= 'ORDER'
[<BY>]         ::= 'BY'

[<FROM>]       ::= 'FROM'
[<NAMED>]      ::= 'NAMED'

[<ASC>]        ::= 'ASC'
[<DESC>]       ::= 'DESC'

[<FILTER>]     ::= 'FILTER'
[<REGEXP>]     ::= 'REGEXP'
[<GRAPH>]      ::= 'GRAPH'
[<UNION>]      ::= 'UNION'
[<OPTIONAL>]   ::= 'OPTIONAL'
[<BOUND>]      ::= 'BOUND'
[<STR>]        ::= 'STR'
[<URI>]        ::= 'URI'
[<DTYPE>]      ::= 'DATATYPE'
[<LANG>]       ::= 'LANG'
[<IS_URI>]     ::= 'isURI'
[<IS_BNODE>]   ::= 'isBLANK'
[<IS_LITERAL>] ::= 'isLITERAL'
[<REGEX>]      ::= 'REGEX'
[<TRUE>]       ::= 'true'
[<FALSE>]      ::= 'false'
[<LPAREN>]     ::= '('
[<RPAREN>]     ::= ')'
[<LBRACE>]     ::= '{'
[<RBRACE>]     ::= '}'
[<LBRACKET>]   ::= '['
[<RBRACKET>]   ::= ']'
[<SEMICOLON>]  ::= ';'
[<COMMA>]      ::= ','
[<DOT>]        ::= '.'
[<GT>]         ::= '>'
[<LT>]         ::= '<'
[<BANG>]       ::= '!'
[<HOOK>]       ::= '?'
[<COLON>]      ::= ':'
[<EQ>]         ::= '='
[<NE>]         ::= '!='
[<LE>]         ::= '<='
[<GE>]         ::= '>='
[<SC_OR>]      ::= '||'
[<SC_AND>]     ::= '&&'
[<INCR>]       ::= '++'
[<DECR>]       ::= '--'
[<PLUS>]       ::= '+'
[<MINUS>]      ::= '-'
[<STAR>]       ::= '*'
[<SLASH>]      ::= '/'
[<DATATYPE>]   ::= '^^'
//[<AT>]         ::= '@'
<#NCCHAR1>     ::= [A-Z] | [a-z] | [#x00C0-#x00D6] | [#x00D8-#x00F6] | [#x00F8-#x02FF] | [#x0370-#x037D] | [#x037F-#x1FFF] | [#x200C-#x200D] | [#x2070-#x218F] | [#x2C00-#x2FEF] | [#x3001-#xD7FF] | [#xF900-#xFDCF] | [#xFDF0-#xFFFD] | [#x10000-#xEFFFF]

<#NCCHAR>      ::=  <NCCHAR1> | '_' | '-' | "." | [0-9] | #x00B7 | [#x0300-#x036F] | [#x203F-#x2040]
<#NCNAME_PREFIX> ::= <NCCHAR1> <NCCHAR>*
<#NCNAME>       ::= ( "_" | <NCCHAR1> ) <NCCHAR>*
<#VARNAME>      ::=  <NCCHAR1> ( <NCCHAR1> | "_" | [0-9] | #x00B7 | [#x0300-#x036F] | [#x203F-#x2040] )*