The Lattice Expression Language letter classes provide expression objects. There is ancilliary information or attributes associated with these objects such as the shape of the region involved in the expression, or whether the result of evaluating an expression is a scalar or not. These attributes are stored in the LELAttribute class. We needed somewhere to store this things. There will be more as time goes on.
Constructor sets it as lattice with given attributes.
Constructor sets it as a region with given attributes.