Changes regarding comments of reviewers:
(1) abovedescribed -> aforementioned
(2) forward reference from 1.2 to section 2 + additional reference back
to figure 2 from 2.4.
(3) Additional remark how the combined ranking handles ambiguous
situations such as where a person is sometimes author sometimes editor
(section 2.4)
(4) Rephrased some uses of the wording "from an angle".
(5) Formula of Jaro-Winkler included
(6) Reference to XPath 2.0 standard.