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• The complex, nested constructs found in widely-used ontologies can now be successfully imported from OWL, visualized in diagrams, augmented with new concept models, and exported to OWL.
• Support is now available for complements Complements between classes are supported.
• Property restrictions can now be modeled in a namespace other than that of its domain, range, or restricted property.
• All subtypes of OWL Object Property (e.g., owl:TransitiveProperty) can now be imported and exported.
• Support is now available for a A property that has multiple domains is supported.
• A UML property used in multiple classes is now interpreted in OWL as a domain that is the union of those classes.
• Unqualified cardinality restrictions is now supported by {subsets} in UML.
• A minimum cardinality of 0 in OWL is retained as a {subsets} to support its use as a flag.
• A literal annotation may now have either a language or a datatype.
• A datatype property can now be modeled as an association end or a class attribute.
• Both IRI and literal annotations are now supported.
• A maximum cardinality restriction without a minimum cardinality restriction on a property is now supported.

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