[
LeftOperand.new(:title, _('Title'), String),
LeftOperand.new(:isbn, _('ISBN'), String),
LeftOperand.new(:authors, _('Authors'), String),
LeftOperand.new(:publisher, _('Publisher'), String),
LeftOperand.new(:publishing_year, _('Publish Year'), Integer),
LeftOperand.new(:edition, _('Binding'), String),
LeftOperand.new(:rating, _('Rating'), Integer),
LeftOperand.new(:notes, _('Notes'), String),
LeftOperand.new(:tags, _('Tags'), Array),
LeftOperand.new(:loaned, _('Loaning State'), TrueClass),
LeftOperand.new(:loaned_since, _('Loaning Date'), Time),
LeftOperand.new(:loaned_to, _('Loaning Person'), String),
LeftOperand.new(:redd, _('Read'), TrueClass),
LeftOperand.new(:redd_when, _('Date Read'), Time),
LeftOperand.new(:own, _('Own'), TrueClass),
LeftOperand.new(:want, _('Want'), TrueClass),
].sort