get_lc_call_subject_classification {libbib}

Conversion from Library of Congress Call number to subject classification

Description

Takes a string representation of a Library of Congress call number and returns either the broad subject classification description (default) based on the first letter, or a second-level subclassification description based on the all the letters

Usage

get_lc_call_subject_classification(
  x,
  subclassification = FALSE,
  already.parsed = FALSE,
  allow.bare = TRUE
)

Arguments

x

A Library of Congress call number (string)

subclassification

A logical indicating whether the letters of call number past the first should be used to match to a subject subclassification (default is FALSE)

already.parsed

Skips the extraction of the subject letters and jumps to the subject matching (default is FALSE)

allow.bare

A logical indicating whether an LC Call with only the letters should be considered valid (default is TRUE)

Value

Returns either the broad (top-level) subject classification description or the second level subject subclassification description. Returns "NA" if no subject could not be matched or call number is invalid

Examples

get_lc_call_subject_classification("ND 237.S18 $b S87 1997")
# Fine Arts

get_lc_call_subject_classification("ND 237.S18 $b S87 1997", subclassification=TRUE)
# Painting

get_lc_call_subject_classification("PQ2246.M3")
# Language and Literature

get_lc_call_subject_classification("PQ2246.M3",
                                   subclassification=TRUE)
# "French, Italian, Spanish, and Portuguese literature"

get_lc_call_subject_classification("PQ2246.M3", already.parsed=TRUE)
# NA

get_lc_call_subject_classification("PQ", already.parsed=TRUE,
                                   subclassification=TRUE)
# "French, Italian, Spanish, and Portuguese literature"

# vectorized
get_lc_call_subject_classification(c("ND 237", "\\\\$a ND 2", "PQ2246.M3"),
                                   subclassification=TRUE)
# c("Painting", NA, "French, Italian, Spanish, and Portuguese literature")