Use XPath to express the following queries to the document in Figure 15.19:

a. Find all Student elements whose Ids end with 987 and who took MAT123.
b. Find all Student elements whose ?rst names are Joe and who took fewer than three courses.
b. Find all Student elements whose ?rst names are Joe and who took fewer than three courses.

a.

//Student[../CrsTaken/@CrsCode="MAT123"

                and ends-with(@StudId,"987")]

b.

//Student[starts-with(@Name,"Joe") and count(../CrsTaken) < 3]

c.

//CrsTaken[@Semester="S1996" and starts-with(../Student/@Name,"P")]