Is Google going to use Libary of Congress Subject Headings or develop their own controlled vocabulary and cross reference structure? Via Searchblog, I read the excerpts from a speech by the President of the University of Michigan, Mary Sue Coleman...
They're from the subject headings that have been assigned to the books in your results list by human catalogers, using a controlled vocabulary called Library of Congress Subject Headings. Taking advantage of subject headings/descriptors can often...
Some electronic databases also attach subject headings, descriptors and the like to help the searcher focus. The Library of Congress has an entire department called the The crawler-compiled card catalog will let you scan every word on every page...
Also, when searching by subject in any library catalog your not searching on classification numbers (Dewey, LCC, etc.but on verbal subject headings, Library of Congress Subject Headings. More on subject headings and classification here.
What Levy gets wrong is that books and other objects are also assigned what Library of Congress Subject Headings. Local libraries can create their own subject headings or modify what the Library of Congress provides.
They've been assigned to the books by human catalogers from a controlled vocabulary called Library of Congress Subject Headings. They're from the subject headings that have been assigned to the books in your results list.
