In entity e3, at line 1, position 0:
Called from entity e2, line 1, position 0:
Called from entity e1, line 1, position 0:
Called from entity [toplevel] = SYSTEM "file://localhost/home/gerd/ocaml/smcvs/ocamlpkg/markup/rtests/negative/data_jclark_notwf/sa/071.xml", line 6, position 5:
ERROR (Validity constraint): Recursive reference to entity `e1'