At Risk

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These features of OWL 2 were marked "at risk" in a published OWL 2 specification. This means that the Working Group identified them as features which might be removed in the future, based on new information (including a lack of evidence of implementations), as described in the W3C Process Document.

1 owl:rational (Ongoing)

The owl:rational datatype might be removed from OWL 2 if implementation experience reveals problems with supporting this datatype.

Still at risk as of 15 April 2009.

On 05 Aug 2009, the group decided: "implementation support for owl:rational has been adequately demonstrated and the feature is no longer considered at-risk".

2 xsd:decimal Core Literal Precision (Obsolete)

In December 2008 drafts:

The new XML Schema spec contains an acknowledged editorial error in the definition of core lexical values for xsd:decimal. This document will be updated to state that core decimal lexical values are those that can be expressed with sixteen decimal digits, as is stated here. This document will be updated to use the wording in the XML Schema spec if the change there is made in time.

Since then, XML Schema 1.1 has fixed the problem, so the OWL definition of xsd:decimal core lexical values now just points to the XML Schema document.

3 owl:dateTime name (Obsolete)

In December 2008 drafts:

The name owl:dateTime is currently a placeholder. XML Schema 1.1 Working Group will introduce a datatype for date-time with required timezone. Once this is done, owl:dateTime will be changed to whatever name XML Schema chooses. If the schedule of the XML Schema 1.1 Working Group slips the OWL 2 Working Group will consider possible alternatives.


Since then, XML Schema has added an appropriate datatype, xsd:dateTimeStamp, so OWL documents now use xsd:dateTimeStamp.

4 rdf:XMLLiteral (Ongoing)

The rdf:XMLLiteral datatype might be removed from OWL 2 if implementation experience reveals problems with supporting this datatype.

Still at risk as of 15 April 2009.

On 5 August 2009, the group decided "implementation support for rdf:XMLLiteral support has been adequately demonstrated and the feature is no longer considered at-risk".