.. _section-Directives:

Directives
----------

Flora directives are statements that are used to give information other than knowledge to the Flora system. The most commonly used directive is the (already mentioned) *namespace prefix declaration*, for example,

.. code-block:: flora

    :- iriprefix{eng_val = http://www.onistt.org/devel/ontology/domain/engineering/engineering_value.owl#}.

Another commonly used directive is:

.. code-block:: flora

    :- setsemantics{inheritance(none)}.

which controls Flora’s built-in ontological rules. **Sunflower**’s OWL importer adds this directive to each generated file, in order to make Flora’s built-in class reasoning more closely aligned with OWL semantics.

At this point, you know enough to start experimenting with Flora content and **Sunflower**. The following sections contain more details on individual topics and Flora language features that are useful in specific situations.