Referential density is a concept of ficto-narrative theory put forward by Thomas G. Pavel in his 1986 book, "Fictional Worlds".
 The concept refers to the referential relationship of a text to a fictional world, the ontology of which can be established by a possible worlds approach.
 A large text that refers to a small fictional world is said to have low referential density, whereas a small text referring to a large fictional world has high referential density.
 The size of the text is measured in abstract terms as amplitude, which in most cases will correspond to its physical length; exceptions to this may arise in cases of embedded discourses, such as metanarratives (or imaging digressions), which refer to the actual world.
 For this reason, the form and genre of a fictional work provide only an approximate indication of its size; by the same token, it is possible to refer to the size and referential density of part of a fictional work.
 The size of a fictional world, in turn, is measured in terms of the sum total of properties applicable to the objects and agents inhabiting the fictional world.
Legends: Short Novels by the Masters of Modern Fantasy is a 1998 anthology of 11 novellas (short novels) by a number of English-language fantasy authors, edited by Robert Silverberg.
 All the stories were original to the collection, and set in the authors' established fictional worlds.
 The anthology won a Locus Award for Best Anthology in 1999.
 Its science fiction equivalent, "Far Horizons", followed in 1999.
Dozens of Square Enix companion books have been produced since 1998, when video game developer Square began to produce books that focused on artwork, developer interviews, and background information on the fictional worlds and characters in its games rather than on gameplay details.
 The first series of these books was the "Perfect Works" series, written and published by Square subsidiary DigiCube.
 They produced three books between 1998 and 1999 before the line was stopped in favor of the "Ultimania" (アルティマニア , Arutimania ) series, a portmanteau of ultimate and mania.
 This series of books is written by Studio BentStuff, which had previously written game guides for Square for "Final Fantasy VII".
 They were published by DigiCube until the company was dissolved in 2003.
 Square merged with video game publisher Enix on April 1, 2003 to form Square Enix, which resumed publication of the companion books.
Carolyn Janice Cherry (born September 1, 1942), better known by the pen name C. J. Cherryh, is an American writer of speculative fiction.
 She has written more than 60 books since the mid-1970s, including the Hugo Award-winning novels "Downbelow Station" (1981) and "Cyteen" (1988), both set in her Alliance-Union universe.
 She is known for "world building," depicting fictional realms with great realism supported by vast research in history, language, psychology, and archeology.
 Her series of fantasy novels set in the Alliance-Union universe, the Morgaine Stories, have sold in excess of 3 million copies.
Legends II: New Short Novels by the Masters of Modern Fantasy is a 2003 collection of 11 short stories by a number of fantasy authors, edited by Robert Silverberg.
 All the stories were original to the collection, and set in the authors' established fictional worlds.
 The first "Legends" was published in 1998.
The Cherryh Odyssey is a 2004 collection of essays by various academics, critics and authors about American Hugo Award-winning science fiction and fantasy author, C. J. Cherryh.
 It was edited by author and academic, Edward Carmien, and was published by Borgo Press, an imprint of Wildside Press as part of its "Author Study" series. "
Locus Magazine" put the book on its "2004 Recommended Reading List", and Carmien received a nomination for the 2005 Locus Award for Best Non-fiction book for "The Cherryh Odyssey".
Fictional languages are constructed languages created as part of a fictional setting, for example in books, movies and video games.
 Fictional languages are intended to be the languages of a fictional world and are often designed with the intent of giving more depth and an appearance of plausibility to the fictional worlds with which they are associated, and to have their characters communicate in a fashion which is both alien and dislocated.
In the fictional worlds of the "Dungeons & Dragons" fantasy role-playing game, demodands (gehreleths in 2nd Edition D&D) are a race of fiends native to the Tarterian Depths of Carceri.
 The gehreleths worship or honor a patron deity called Apomps the Three-sided One, a renegade baernaloth who was exiled to Carceri for the act of creating them.
 Each of the races has certain peculiarities.
 The farastu and the kelubar can undergo a lengthy and painful process of self-liquefaction into the secretion they most frequently exude.
 These pools of tar and slime can be bottled and stored for centuries as a kind of 'instant army'.
Magic of "Dungeons & Dragons" consists of spells used in the settings of the role-playing game "Dungeons & Dragons" ("D&D").
 "D&D" defined the genre of fantasy role-playing games, and remains the most popular.
 Many of the original spells have become widely used in the role-playing community, across many different fictional worlds, and across books, board games, video games, and movies.
Extraterrestrial (also Alien Worlds in the UK) is a British-American two-part television documentary miniseries, aired in 2005 in the UK by Channel 4, by the National Geographic Channel (as Extraterrestrial) in the US on Monday, May 30, 2005 and produced by Blue Wave Productions Ltd.
 The program focuses on the hypothetical and scientifically feasible evolution of alien life on extrasolar planets, providing model examples of two different fictional worlds, one in each of the series's two episodes.

Question: Which American fantasy author was the subject of an "Odyssey" of essays in 2004, about her works and fictional worlds?
Answer: C. J. Cherryh