What I've been doing is:
I choose the bigger element or most relevent tag in cases where it could be one or another.
How I've defined them for myself:
Collection = short stories or other elements all by one author.
Anthology = short stories or other elements by more than one author.
Omnibus = multiple long elements + whatever short stories and essays, etc.
Omnibus is also either Collection or Anthology.
In my case, using abbreviations or human-readable:
[Col or Collection
[An or Anthology
[Om or Omnibus
Book may contain more than one of those tags, such as:
Title1 has [Col, [Om
Title2 has [An, [Om
Last edited by unboggling; 08-21-2011 at 12:04 PM.