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SPARQL Maintenance (EXISTS) Community Group

The "SPARQL Maintenance (EXISTS)" Community Group is a forum to discuss and address problems with the "EXISTS" feature in SPARQL 1.1. The SPARQL 1.1 suite of specifications and the SPARQL 1.1 test suite are frozen. A process exists to record errata and that will be one input to any working group chartered to revise SPARQL. In the meantime, SPARQL is being used in real-work systems in industry and public-sector. The user community expects a high degree of conformance across implementations. The EXISTS feature has been found to be problematic. This feature is used by the RDF Data Shapes Working Group. This community group will create CG Notes and accompanying test suites to describe one or more improvements with an emphasis on maintaining compatibility. This group is not producing specifications. Any tests produced by the will submitted to the RDF Test Suite Curation CG for long-term stewardship.

Note: Community Groups are proposed and run by the community. Although W3C hosts these conversations, the groups do not necessarily represent the views of the W3C Membership or staff.

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Call for Participation in SPARQL Maintenance (EXISTS) Community Group

The SPARQL Maintenance (EXISTS) Community Group has been launched:


The “SPARQL Maintenance (EXISTS)” Community Group is a forum to discuss and address problems with the “EXISTS” feature in SPARQL 1.1.

The SPARQL 1.1 suite of specifications and the SPARQL 1.1 test suite are frozen. A process exists to record errata and that will be one input to any working group chartered to revise SPARQL.

In the meantime, SPARQL is being used in real-work systems in industry and public-sector. The user community expects a high degree of conformance across implementations.

The EXISTS feature has been found to be problematic. This feature is used by the RDF Data Shapes Working Group.

This community group will create CG Notes and accompanying test suites to describe one or more improvements with an emphasis on maintaining compatibility.

This group is not producing specifications.

Any tests produced by the will submitted to the RDF Test Suite Curation CG for long-term stewardship.


In order to join the group, you will need a W3C account. Please note, however, that W3C Membership is not required to join a Community Group.

This is a community initiative. This group was originally proposed on 2016-07-01 by Andy Seaborne. The following people supported its creation: Andy Seaborne, A Soroka, Peter Patel-Schneider, Simon Steyskal, Axel Polleres. W3C’s hosting of this group does not imply endorsement of the activities.

The group must now choose a chair. Read more about how to get started in a new group and good practice for running a group.

We invite you to share news of this new group in social media and other channels.

If you believe that there is an issue with this group that requires the attention of the W3C staff, please email us at site-comments@w3.org

Thank you,
W3C Community Development Team