# The query layer

Predicates, selections, and query plans. The [queries](../queries/index.md)
section explains the model; the [syntax reference](../queries/syntax.md)
defines every accepted form.

```{eval-rst}
.. autofunction:: h5col.field

.. autoclass:: h5col.query.Field
   :members:

.. autoclass:: h5col.Expression
   :members:

.. autoclass:: h5col.Selection
   :members:

.. autoclass:: h5col.QueryPlan
   :members:

.. autoclass:: h5col.query.TermPlan
   :members:

.. autoclass:: h5col.query.LeafPlan
   :members:
```