What is the right way to cite @inproceedings with biblatex?

Question

What is the right way to cite @inproceedings with biblatex?

More specifically, many computer science proceedings paper citations seem to use book titles like "Proceedings of the 28th Annual ACM/IEEE Symposium on Logic in Computer Science". How should this book title be broken down for the biblatex fields?

Here are several combinations of booktitle, booksubtitle, and booktitleaddon. Which is the best practice based on the biblatex model?

@inproceedings{key,
  ...,
  booktitle = {Proceedings of the 28th Annual ACM/IEEE Symposium on Logic in Computer Science},
  ...
}

@inproceedings{key,
  ...,
  booktitle = {Logic in Computer Science},
  booksubtitle = {Proceedings of the 28th Annual ACM/IEEE Symposium}, 
  ...
}

@inproceedings{key,
  ...,
  booktitle = {Logic in Computer Science},
  booktitleaddon = {Proceedings of the 28th Annual ACM/IEEE Symposium}, 
  ...
}

Answer 1

An example from biblatex-examples.bib:

@inproceedings{salam,
  author       = {Salam, Abdus},
  editor       = {Svartholm, Nils},
  title        = {Weak and Electromagnetic Interactions},
  date         = {1968},
  booktitle    = {Elementary particle theory},
  booksubtitle = {Relativistic groups and analyticity},
  booktitleaddon= {Proceedings of the Eighth Nobel Symposium},
  eventdate    = {1968-05-19/1968-05-25},
  venue        = {Aspen{\"a}sgarden, Lerum},
  publisher    = {Almquist \& Wiksell},
  location     = {Stockholm},
  pages        = {367-377},
}

So if there is a dedicated title field, standard seems to be to put the "Proceedings of ..." part into the (book)titleaddon field.

It is probably best to put 2013 28th Annual ACM/IEEE Symposium on Logic in Computer Science into the title field, if there is no other title available - after all we do not want to have an empty title field.

@proceedings{lics,
  title        = {2013 28th Annual ACM/IEEE Symposium on Logic in Computer Science},
  shorttitle   = {LICS},
  eventdate    = {2013-06-25/2013-06-28},
  venue        = {New Orleans, Louisiana},
  isbn         = {978-1-4799-0413-6},
  publisher    = {IEEE Computer Society},
  date         = {2013},
}
@inproceedings{pattinson,
  author      = {Pattinson, Dirk},
  title       = {The Logic of Exact Covers},
  subtitle    = {Completeness and Uniform Interpolation},
  crossref    = {lics},
  pages       = {418-427},
}

Another solution would be your third idea, though that does not reflect the title information as given in the proceedings itself.

@proceedings{lics,
  booktitle    = {Logic in Computer Science},
  booktitleaddon = {Proceedings of the 28th Annual ACM/IEEE Symposium}, 
  shorttitle   = {LICS},
  eventdate    = {2013-06-25/2013-06-28},
  venue        = {New Orleans, Louisiana},
  isbn         = {978-1-4799-0413-6},
  publisher    = {IEEE Computer Society},
  date         = {2013},
}