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--- stats:proc:removeparticipant [2011/09/27 20:54] – created Patrick Michel
+++ stats:proc:removeparticipant [2013/07/10 12:34] (current) – external edit 127.0.0.1
@@ Line 2: / Line 2: @@
 <code xcend>
-removeParticipant(ident id, ident studentId) {
+removeParticipant(ident uid, ident id, ident studentId) {
-  assume exists //exams/exam[id]/results/participant[studentId]; # implies the exam exists, which is implicitly true anyway
+  assume exists /account[uid]/student && /account[uid]/student/id = studentId && /exam[id]/free
+      || exists /account[uid]/examiner[id];
-  remove //exams/exam[id]/results/participant[studentId];
+  assume exists /exam[id]/participant[studentId]; # implies the exam exists, which is implicitly true anyway
+  assume size(/exam[id]/participant[studentId]/result) = 0; # don't allow to remove if results are there
+  remove /exam[id]/participant[studentId];
 }
 </code>