Thanks to all who have responded. This has confirmed our assumptions, and the 
results were:

- not at all: 44%
- not very important, I can use SPIN or Jena rules instead: 44%
- important for my research: 11%
- important for production applications: 0%

TopBraid Suite 3.4 will be the last version with SWRL support for now. 3.5 will 
have greatly improved SPIN support instead.

Regards,
Holger


On Apr 4, 2011, at 9:49 AM, Holger Knublauch wrote:

> Dear users,
> 
> now that SPIN is a W3C submission, it has reached the same standard status
> as SWRL. Furthermore, SPIN has key advantages to SWRL:
> 
> - It uses SPARQL - a standard supported by every RDF store
> - Unlike SWRL, SPIN is an active effort. SWRL has been made obsolete by RIF
> while SPIN is complementary to RIF
> 
> SWRL support in TopBraid has always been limited. This is not unique to
> TopBraid. In general, SWRL has had little traction which is one of the key
> reasons for it becoming obsolete. No major RDF stores or rules engines
> support SWRL.
> 
> Because of this, rather than try to improve SWRL support, we want to focus
> on creating a world class SPARQL Rules (SPIN) support. Our goal is to make
> this direction clear and to avoid any unnecessary confusion for our users.
> With this in mind we are planning to remove SWRL support from the upcoming
> 3.5 release. We would leave Jena rules support in.
> 
> To help us ensure that this will not adversely impact a large user group, we
> are asking you to respond to this quick poll:
> 
>       http://micropoll.com/t/KEs31ZByL8
> 
> Thank you
> Holger
> 
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