vcsn::rat::location location
Pairs of positions in a file/stream. 
 
::vcsn::direction direction
Direction for proper on automata. 
 
value_impl< detail::label_tag > label
 
vcsn::rat::position position
Position in a file/stream. 
 
::vcsn::rat::identities identities
Sets of identities on expressions. 
 
An expressionset can implement several different sets of identities on expressions.