Create the list of all courses in which Joe Public received an A.

Using the document structure described in Exercise 15.23, formulate the following queries in XQuery:

{

     LET $sset := doc("http://xyz.edu/student.xml")

                                                //tuple[Name/@value="Joe Public"]

     FOR $c IN doc("http://xyz.edu/course.xml")//tuple,

             $s IN $sset

     WHERE doc("http://xyz.edu/transcript.xml")

                                             //tuple[StudId/@value=$s/Id/@value

                                                         and Grade/@value="A"]                                       

     RETURN $c

}