More accurate wording in supported_formats.md (#243)

Author: kysrpex

docs/usage/ontologies/supported_formats.md

@@ -20,34 +20,28 @@ supports:
 
 ## Limitations
 
-At the moment, there are a few limitations on the supported features of OWL 2
-ontologies.
+At the moment, there are significant limitations on the supported features of
+OWL 2 ontologies.
 
 ### OWL 2 ontologies
 
-Not all predicates of OWL ontologies are taken into
-consideration. Among the used ones are:
+Not all features of OWL ontologies are taken into consideration. Among the used
+ones are:
 
 - `RDF.type` to determine the type of the entities.
-- `RDFS.label` to get the entities by label.
-- `RDFS.isDefinedBy` to get a descriptions for the entities.
-- `RDFS.subClassOf` / `RDFS.subPropertyOf` for subclasses.
+- `RDFS.label` and `SKOS.prefLabel` to get the entities by label.
+- `RDFS.subClassOf` / `RDFS.subPropertyOf` for subclasses and subproperties.
 - `OWL.inverseOf` for inverse relationships.
-- `RDFS.range` to determine the datatype of `DataProperties`. These are the supported
-  datatypes:
-  - `XSD.boolean`
-  - `XSD.integer`
-  - `XSD.float`
-  - `XSD.string`
+- `RDFS.range` to determine the datatype of `DataProperties`.
 - To get the attributes of an owl class, we use
   - The `RDFS.domain` of the `DatatypeProperties`, if it is a simple class.
   - Restrictions on the ontology classes.
-  - Furthermore, all DataProperties are considered functional, see [this issue](https://github.com/simphony/osp-core/issues/416).
 - Restrictions and compositions are also supported. They can be consulted
-  using the [`axioms` attribute of ontology classes](../ontology_interface.ipynb#Operations-specific-to-ontology-axioms).
+  using the
+  [`axioms` attribute of ontology classes](../terminological_knowledge.ipynb#Ontology-axioms).
+
+We try to enlarge this list over time and support more of the OWL DL
+specification.
 
 No reasoner is included. We plan to include a reasoner in the
 future.
-
-We try to shrink this list over time and support more of the
-OWL DL specification.