A survey in indexing and searching XML documents

Introduction This is my personal “summary in 337 one-liners” of A Survey in Indexing and Searching XML Documents by Luk et al. (2002) [1]. I focus on technical aspects, omitting all system names and references. In my opinion, one cannot learn any technique from the survey: it only mentions various techniques but does not explain any. Alas, my 337 one-liners are even less informative. The survey itself can be used as a test whether you already knew all the things that it mentions, and the classification that it gives. Further, the survey is useful as a rather complete collection of references to the literature (and this aspect is completely omitted in this summary). I am impressed by the apparent completeness of the survey, but I consider most of it badly written (unclear, incomprehensible and in bad English).