string_literal_quote

It's trivial, but any particular reason to diverge from SPARQL and 
rename the string literal non-terminals?

Turtle has:

[22] 	|STRING_LITERAL_QUOTE| 	::= 	'|"|' ([|^#x22#x5C#xA#xD|] || | ECHAR 
<https://dvcs.w3.org/hg/rdf/raw-file/default/rdf-turtle/index.html#grammar-production-ECHAR> 
|| | UCHAR 
<https://dvcs.w3.org/hg/rdf/raw-file/default/rdf-turtle/index.html#grammar-production-UCHAR>)|*| 
'|"|'
[23] 	|STRING_LITERAL_SINGLE_QUOTE| 	::= 	"|'|" ([|^#x27#x5C#xA#xD|] || 
| ECHAR 
<https://dvcs.w3.org/hg/rdf/raw-file/default/rdf-turtle/index.html#grammar-production-ECHAR> 
|| | UCHAR 
<https://dvcs.w3.org/hg/rdf/raw-file/default/rdf-turtle/index.html#grammar-production-UCHAR>)|*| 
"|'|"
[24] 	|STRING_LITERAL_LONG_SINGLE_QUOTE| 	::= 	"|'''|" (("|'|" || | 
"|''|")? [|^'\|] || | ECHAR 
<https://dvcs.w3.org/hg/rdf/raw-file/default/rdf-turtle/index.html#grammar-production-ECHAR> 
|| | UCHAR 
<https://dvcs.w3.org/hg/rdf/raw-file/default/rdf-turtle/index.html#grammar-production-UCHAR>)|*| 
"|'''|"
[25] 	|STRING_LITERAL_LONG_QUOTE| 	::= 	'|"""|' (('|"|' || | '|""|')? 
[|^"\|] || | ECHAR 
<https://dvcs.w3.org/hg/rdf/raw-file/default/rdf-turtle/index.html#grammar-production-ECHAR> 
|| | UCHAR 
<https://dvcs.w3.org/hg/rdf/raw-file/default/rdf-turtle/index.html#grammar-production-UCHAR>)|*| 
'|"""|'


SPARQL has:

|[156] | 	|STRING_LITERAL1| 	  ::= 	|"'" ( ([^#x27#x5C#xA#xD]) | ECHAR 
<http://www.w3.org/TR/sparql11-query/#rECHAR> )* "'"|
|[157] | 	|STRING_LITERAL2| 	  ::= 	|'"' ( ([^#x22#x5C#xA#xD]) | ECHAR 
<http://www.w3.org/TR/sparql11-query/#rECHAR> )* '"'|
|[158] | 	|STRING_LITERAL_LONG1| 	  ::= 	|"'''" ( ( "'" | "''" )? ( 
[^'\] | ECHAR <http://www.w3.org/TR/sparql11-query/#rECHAR> ) )* "'''"|
|[159] | 	|STRING_LITERAL_LONG2| 	  ::= 	|'"""' ( ( '"' | '""' )? ( 
[^"\] | ECHAR <http://www.w3.org/TR/sparql11-query/#rECHAR> ) )* '"""'|


I'd think we should just stick with the productions from SPARQL (modulo 
UCHAR which is an orthogonal issue).

          -- Sandro