+ /**
+ * Creates a new CQLRelation with the specified base relation.
+ * Typical base relations include the usual six ordering relations
+ * (<TT><=</TT>, <TT>></TT>, <I>etc.</I>), the text
+ * relations <TT>any</TT>, <TT>all</TT> and <TT>exact</TT> and the
+ * server-choice relation <TT>scr</TT>.
+ */