1. OWL W3C WORKING GROUP F2F MEETING M. Vacura

2. OWL 2  OWL 2 extends the OWL 1.0 with a small but useful set of features that have been requested by users, for which effective reasoning algorithms are now available, and that OWL tool developers are willing to support.

3. OWL 2 The new features include:  extra syntactic sugar  additional property and qualified cardinality constructors  extended datatype support  simple metamodelling  extended annotations

4. Additional constructors PropertyAssertion( a:hasPet a:Peter a:Brian ) ClassAssertion( MaxCardinality(1 a:hasPet ) a:Peter) a:Peter has at most one pet. The maximum cardinality expression MaxCardinality(2 a:hasPet) contains those individuals that are connected by a:hasPet to at most two individuals. a:Peter is classified as an instance of MaxCardinality(2 a:hasPet)

5. Data Property Restrictions  Class expressions in OWL 2 can be formed by placing restrictions on data property expressions.  Class expressions such as "individuals whose width is greater than their height"

6. Extended datatype support  Number types (rational numbers)  Date and time types  N-Ary

7. Simple metamodelling Punning:  In RDF (similary in OWL Full), all possible combinations of punning are allowed.  you can use the same URI for class and a datatype and a property. OWL 2 – some restrictions (??)  No punning between classes and datatypes.  No punning between object and data properties.

8. Extended annotations Alan's "Richer Annotations" proposal Bijan's "Rich Annotations" proposal  We can have "blobs" of annotations associated with an Entity or Axiom, rather than a single statement per annotation.  Annotations can live in multiple separate "annotation spaces". The easiest way to think about these is if you took the annotations in a space and put them in a separate document.  Annotations can be marked as affecting the content of the domain model.