Please note that this tool may return a permissions or access error if a custom (“de novo”) SPARQL query is interrupted by site security protocols.

To safeguard system performance and stability, the server has been configured to automatically block queries that are malformed, excessively resource-intensive, or potentially harmful to backend services. This includes queries that could inadvertently affect server availability.

To assist developers and users, a set of sample SPARQL queries is provided. We strongly encourage starting with these examples to become familiar with expected query structures and limitations before submitting custom requests.

If you encounter repeated permissions errors, review your query for structural issues or performance concerns, or consider adapting a sample query as a starting point, or contact the caDSR team at caDSR.RA@mail.nih.gov