1 files changed, 55 insertions, 0 deletions
diff --git a/spec/syntax.zbnf b/spec/syntax.zbnf
new file mode 100644
index 0000000..5656864
--- /dev/null
+++ b/spec/syntax.zbnf
@@ -0,0 +1,55 @@
+Unit          : Blank* ( Datum [Blank] | EOF )
+
+
+Blank         : 9...13 | Comment
+
+Datum         : OneDatum ( [JoinChar] OneDatum )*
+
+JoinChar      : '.' | ':'
+
+
+Comment       : ';' ( SkipUnit | SkipLine )
+
+SkipUnit      : '~' Unit
+
+SkipLine      : ( ~LF )* [LF]
+
+
+OneDatum      : BareString | CladDatum
+
+BareString    : ( '.' | '+' | '-' | DIGIT ) ( BareChar | '.' )*
+              | BareChar+
+
+CladDatum     : '|' PipeStrElt* '|'
+              | '"' QuotStrElt* '"'
+              | '#' HashExpr
+              | '(' List ')' | '[' List ']' | '{' List '}'
+              | "'" Datum | '`' Datum | ',' Datum
+
+
+BareChar      : ALPHA | DIGIT
+              | '!' | '$' | '%' | '&' | '*' | '+' | '-' | '/'
+              | '<' | '=' | '>' | '?' | '@' | '^' | '_' | '~'
+
+
+PipeStrElt    : ~( '|' | '\' ) | '\' StringEsc
+
+QuotStrElt    : ~( '"' | '\' ) | '\' StringEsc
+
+HashExpr      : Rune [ '\' BareString | CladDatum ]
+              | '\' BareString
+              | '%' Label ( '%' | '=' Datum )
+              | CladDatum
+
+List          : Unit* [ '.' Unit ] Blank*
+
+
+StringEsc     : '\' | '|' | '"' | ( HTAB | SP )* LF ( HTAB | SP )*
+              | 'a' | 'b' | 't' | 'n' | 'v' | 'f' | 'r' | 'e'
+              | 'x' ( HEXDIG{2} )+ ';'
+              | 'u' HEXDIG{1,6} ';'
+
+
+Rune          : ALPHA ( ALPHA | DIGIT ){0,5}
+
+Label         : HEXDIG{1,12}