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Gutenberg metadata about the subject of each work

Source: R/data.R
gutenberg_subjects.Rd

Gutenberg metadata about the subject of each work, particularly Library of Congress Classifications (lcc) and Library of Congress Subject Headings (lcsh).

Usage

gutenberg_subjects

Format

A tbl_df (see tibble or dplyr) with one row for each pairing of work and subject, with columns:

gutenberg_id

ID describing a work that can be joined with gutenberg_metadata

subject_type

Either "lcc" (Library of Congress Classification) or "lcsh" (Library of Congress Subject Headings)

subject

Subject

Details

Find more information about Library of Congress Categories here: https://www.loc.gov/catdir/cpso/lcco/, and about Library of Congress Subject Headings here: https://id.loc.gov/authorities/subjects.html.

To find the date on which this metadata was last updated, run attr(gutenberg_subjects, "date_updated").

See also

gutenberg_metadata, gutenberg_authors

Examples

if (FALSE) { # interactive()

library(dplyr)
library(stringr)

gutenberg_subjects %>%
  filter(subject_type == "lcsh") %>%
  count(subject, sort = TRUE)

sherlock_holmes_subjects <- gutenberg_subjects %>%
  filter(str_detect(subject, "Holmes, Sherlock"))

sherlock_holmes_subjects

sherlock_holmes_metadata <- gutenberg_works() %>%
  filter(author == "Doyle, Arthur Conan") %>%
  semi_join(sherlock_holmes_subjects, by = "gutenberg_id")

sherlock_holmes_metadata

# \donttest{
holmes_books <- gutenberg_download(sherlock_holmes_metadata$gutenberg_id)

holmes_books
# }

# date last updated
attr(gutenberg_subjects, "date_updated")
}