Notice
2. Statements
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Descriptif
This video présents the SPARQL Statements.
The first statement is the optional pattern. It enables to specify a part of a graph pattern that is not mandatory in the answer of the query. In the example below, there is a mandatory part which is the person variable with the homepage Fabien, then there's an optional part of the query, where we would like to have the name of the resource person, but if we find no name in the target graph, the query will not fail, we will still have a result. So among the result of this query, we may have values, or not for the name variable and so in some results, the name variable may be unbound, that means that this variable may have no value in the results.
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