Question

What will happen if you specify a data source using the FROM keyword in your SPARQL query and then specify another data source when you call the SPARQL processor?

a) The processor will automatically merge the data sources
b) An error will occur, as only one data source can be specified
c) The processor will use the data source specified during processing
d) It will prompt the user to choose a data source at runtime

Answer 1

If different data sources are specified within a SPARQL query and on the processor level, the processor will typically prioritize the data source indicated during processing. However, this behavior can vary with different SPARQL processors.

Step-by-step explanation:

When you specify a data source using the FROM keyword in a SPARQL query, and then specify a different data source when you call the SPARQL processor, what usually happens is c) the processor will use the data source specified during processing.

This means that if you run the query through a SPARQL endpoint or processor and point it to a specific data source, that is the one it will use, regardless of what is specified in the FROM clause of the query. However, behavior might differ slightly based on the specific SPARQL processor implementation. Some systems might also allow you to configure the precedence of data source specification. It is good practice to be consistent in specifying data sources and to refer to the documentation of the specific SPARQL processor for exact behavior.