https://www.w3.org/2013/sparql-errata - [x] [clarification-query-1](https://www.w3.org/2013/sparql-errata#clarification-query-1) - [x] [clarification-query-2](https://www.w3.org/2013/sparql-errata#clarification-query-2) - [x] [clarification-query-3](https://www.w3.org/2013/sparql-errata#clarification-query-3)
