3 questions: 1. author parts order 2. text-case: sentence/title 3. sort citation
1. How "Einstein A." and "A. Einstein" are different in the style file? I compared style file of IEEE and nature but could not find the answer.
2. What does it mean by 'title' or 'sentence' in text-case? Any examples?
3. Why citation within text should be sorted? Any examples?
743 ## The sort element specifies the sort order for a citation or for the
744 ## bibliography. If it is not added, citations are sorted according to user
745 ## preferences, and bibliography is sorted according to order cited.
746 sort = element cs:sort { key+ }
2. What does it mean by 'title' or 'sentence' in text-case? Any examples?
3. Why citation within text should be sorted? Any examples?
743 ## The sort element specifies the sort order for a citation or for the
744 ## bibliography. If it is not added, citations are sorted according to user
745 ## preferences, and bibliography is sorted according to order cited.
746 sort = element cs:sort { key+ }
2) You can find a definition of each here: http://thatotherpaper.com/style/title_case_and_sentence_case
Note that support for sentence case in Zotero is currently rather limited: http://forums.zotero.org/discussion/5464/apa-citation-style-capitalization/?Focus=28834#Comment_28834
3) A style might require that citations in text are sorted by date (e.g. (Doe 1999, Johnson 2000, Abe 2008)), or alphabetically (e.g. (Abe 2008, Doe 1999, Johnson 2000)).
P.S. fbennett is right in the post below. For IEEE the name-as-sort-order is already set to "all", so in that particular case specifying a sort-separator is sufficient.