Metadata               ::= ID "=" MetadataValue.
MetadataValue          ::= MetadataValueSingle | MetadataValueList | MetadataValueMap.
MetadataValueSingle    ::= INTEGER | Double | CHAR | STRING | BOOLEAN | QName.
MetadataValueList      ::= "[" (MetadataValue ("," MetadataValue)*)? "]".
MetadataValueMap       ::= "[" (MetadataValueMapEntry ("," MetadataValueMapEntry)*)? "]".
MetadataValueMapEntry  ::= MetadataValue ":" MetadataValue.

Integer                 ::= (0..9)+.
Double                  ::= (0..9)* "." (0..9)+.
Boolean                 ::= ("true" | "false").
Char                    ::= "'" Unicode-Character "'".
String                  ::= '"' (Unicode-Character)* '"'.   
Range                   ::= (0..9)+ ".." (0..9)+.
List                    ::= "[" (Expression ("," Expression)*)? "]".  
Map                     ::= "[" (MapKeyValue ("," MapKeyValue)*)? "]".
MapKeyValue             ::= Expression ":" Expression.
Null                    ::= "null".

Range r = 1..10;
List l  = [1, 2, 3];
Map m   = ["key1":1, "key2":2];

ID                      ::= ("a".."z"|"A".."Z"|"_")("a".."z"|"A".."Z"|"_"|"0".."9")*.
QName                   ::= ID ("." ID)*
Namespace              ::= "use" QualifiedNameWithWildcard ";".
QualifiedNameWildcard  ::= QualifiedName (".*")?

use java::util::*;
use de::uniol::inf::is::odysseus::core::ISubscription;
use com::google::common::collect::ImmutableMap;

GPLCode                ::= "$*" GPL Code "*$"

$*
public static void main(String[] args) {
         
}
*$

Comment                 ::= SingeLineComment | MultiLineComment.
SingeLineComment        ::= "//" Text (("\r")? "\n")?.
MultiLineComment        ::= "/*" Text "*/".

// This is a single line comment

/*
 * This is a multi line comment
 */