[chaley]

Originally Posted by theducks

It is tags
and is the key word for Calibe usage.
I would also quote phases like "time travel"
= in there for exact match

Originally Posted by Sirtel

tag works just as well. I use it all the time. But yes, time travel should be in quotes.

Calibre columns can have aliases, internally called 'search terms'. Here is the list of aliases (usually only one) for standard calibre metadata, taken from calibre's code.

Spoiler:

'Internal calibre column name'
   'name': Column header string,
   'search_terms': Valid lookup names for the column
--------------------------------------
'authors'
   'name':_('Authors'),
   'search_terms':['authors', 'author'],
'languages', 
   'name':_('Languages'),
   'search_terms':['languages', 'language'],
'series',    
   'name':ngettext('Series', 'Series', 1),
   'search_terms':['series'],
'formats'
   'name':_('Formats'),
   'search_terms':['formats', 'format'],
'publisher', 
   'name':_('Publisher'),
   'search_terms':['publisher'],
'rating',    
   'name':_('Rating'),
   'search_terms':['rating'],
'news',      
   'name':_('News'),
   'search_terms':[],
'tags',      
   'name':_('Tags'),
   'search_terms':['tags', 'tag'],
'identifiers'
   'name':_('Identifiers'),
   'search_terms':['identifiers', 'identifier', 'isbn'],
'author_sort',
   'name':_('Author sort'),
   'search_terms':['author_sort'],
'au_map',    
   'name':None,
   'search_terms':[],
'comments',  
   'name':_('Comments'),
   'search_terms':['comments', 'comment'],
'cover',     
   'name':_('Cover'),
   'search_terms':['cover'],
'id',        
   'name':None,
   'search_terms':['id'],
'last_modified', 
   'name':_('Modified'),
   'search_terms':['last_modified'],
'ondevice',  
   'name':_('On device'),
   'search_terms':['ondevice'],
'path',      
   'name':_('Path'),
   'search_terms':[],
'pubdate'
   'name':_('Published'),
   'search_terms':['pubdate'],
'marked',    
   'name': None,
   'search_terms':['marked'],
'series_index',
     'name':None,
     'search_terms':['series_index'],
'series_sort',  
   'name':_('Series sort'),
   'search_terms':['series_sort'],
'sort',      
   'name':_('Title sort'),
   'search_terms':['title_sort'],
'size',      
   'name':_('Size'),
   'search_terms':['size'],
'timestamp', 
   'name':_('Date'),
   'search_terms':['date'],
'title',     
   'name':_('Title'),
   'search_terms':['title'],
'uuid',      
   'name':None,
   'search_terms':['uuid']