If P and P' are non-equivalent basic graph patterns and F and F' are non-equivalent filters, then which of the following group graph patterns is not equivalent to all the others that are listed: code example
Example: sparql if bound query
// Don't forget to bind it to a varible
// if you're using it in a select clause
select ?name ?age ( if(bound(?gen), ?gen, 'None') as ?gender )