HORIZON PROJECT

range-set  ::= range ( logical-or range ) *

logical-or ::= ( ' ' ) * '||' ( ' ' ) *

range      ::= hyphen | simple ( ' ' simple ) * | ''

hyphen     ::= partial ' - ' partial

simple     ::= primitive | partial | tilde | caret

primitive  ::= ( '<' | '>' | '>=' | '<=' | '=' ) partial

partial    ::= xr ( '.' xr ( '.' xr qualifier ? )? )?

xr         ::= 'x' | 'X' | '*' | nr

nr         ::= '0' | [1-9] ( [0-9] ) *

tilde      ::= '~' partial

caret      ::= '^' partial

qualifier  ::= ( '-' pre )? ( '+' build )?

pre        ::= parts

build      ::= parts

parts      ::= part ( '.' part ) *

part       ::= nr | [-0-9A-Za-z]+