create table slices (
  number integer not null,
  number_of_elements integer not null,
  size integer not null,
  has_content boolean not null,
  has_next boolean not null,
  has_previous boolean not null,
  is_first boolean not null,
  is_last boolean not null
);
comment on table slices is '
  An cursor Slice for iterating through sets.
';

comment on column slices.number is '
  The number of the current Slice.
';
comment on column slices.number_of_elements is '
  The number of elements currently on this Slice.
';
comment on column slices.size is '
  The size of this Slice.
';
comment on column slices.has_content is '
  Is there any content for this Slice.
';
comment on column slices.has_next is '
  Is there is a next Slice.
';
comment on column slices.has_previous is '
  Is there is a previous Slice.
';
comment on column slices.is_first is '
  Is this the first Slice.
';
comment on column slices.is_last is '
  Is this the last Slice.
';