+  Arg [2]       : (optional) String
+                  The subset within the ontolgy to which the query
+                  should be restricted.  The subset may be specified
+                  as a SQL pattern, e.g., "goslim%".
+
+  Arg [3]       : (optional) Boolean
+                  If true (non-zero), only return the closest
+                  terms.  If this argument is true, and the previous
+                  argument is left undefined, this method will
+                  return the parents of the given term.
+
+  Description   : Given a child ontology term, returns a list of
+                  all its ancestor terms, up to and including any
+                  root term.  Relations of the type 'is_a' and
+                  'part_of' are followed.  Optionally, only terms in
+                  a given subset of the ontology may be returned,
+                  and additionally one may ask to only get the
+                  closest term(s) to the given child term.