How to add a string variable to the sparql query?

@tressie.damore 

To add a string variable to a SPARQL query, you can use the BIND keyword to assign the string variable a value within the query. Here is an example of how you can add a string variable to a SPARQL query:

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PREFIX foaf: <http://xmlns.com/foaf/0.1/>
SELECT ?person ?name
WHERE {
  BIND("John Doe" AS ?name)
  ?person foaf:name ?name
}

In this example, we are binding the string "John Doe" to the variable ?name within the SPARQL query. You can replace "John Doe" with any string variable you want to add to your SPARQL query.