//pub type Class = usize;

pub const NULL     :usize = 0x00;
pub const VARYING  :usize = 0x01;
pub const BOOLEAN  :usize = 0x02;
pub const NATURAL  :usize = 0x10;
pub const INTEGER  :usize = 0x11;
//pub const DECIMAL  :usize = 0x12;
pub const SIGNIFICANT :usize = 0x13;
//pub const COMPLEX  :usize = 0x14;
//pub const RANGE    :usize = 0x1c;
//pub const CHAR     :usize = 0x1d;
pub const BLOCK    :usize = 0x1e;
pub const SEQUENCE :usize = 0x1f;
//pub const OPTIONAL  :usize = 0x20;
//pub const SET      :usize = 0x21;
pub const ARRAY    :usize = 0x22;
pub const LIST     :usize = 0x23;
pub const SPARSE   :usize = 0x24;
//pub const TRIE     :usize = 0x25;
//pub const MAP      :usize = 0x26;
//pub const TREE     :usize = 0x27;
//pub const GRAPH    :usize = 0x28;
pub const RECORD   :usize = 0x7e;
pub const SCHEMA   :usize = 0x7f;