How to bind a string with a variable in sparql?

@mac 

In SPARQL, you can bind a string with a variable using the BIND keyword. Here's an example:

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SELECT ?person ?name
WHERE {
   ?person foaf:name ?name .
   BIND("John" as ?name)
}

In this example, we are binding the string "John" with the variable ?name using the BIND keyword. This will retrieve all the triples where the person's name is "John".