Multiple subjects/genres

[Grunthos]

Google lists I, Robot under:

Fiction / Media Tie-In
Fiction / Science Fiction / General
Fiction / Science Fiction / High Tech
Fiction / Science Fiction / Short Stories
Robots
Science fiction
Science fiction, American
Short stories, American

Amazon has:

Science Fiction
Fiction - Science Fiction
Fiction
Media Tie-In - General
Science Fiction - High Tech
Short stories
Fiction / Science Fiction / General
Science Fiction - General

LibraryThing has:

Feature
Robots › Fiction
Rock music
Science fiction
Science fiction, American

These are pretty varied, and maybe even silly (Rock Music)...but it would be nice to have the same in BookCatalogue.

Prior to doing this we might need a gerealized 'aliases' system to translate, eg,

'Fiction - Science Fiction' -> 'Fiction / Science Fiction'
and
'Science Fiction - General' -> 'Fiction / Science Fiction / General'

etc. Perhaps based on some advice from a person who knows more about libraries than I!