Objects of class "person" can hold information about an
arbitrary positive number of persons. These can be obtained by one
call to person() with list arguments, or by first creating
objects representing single persons and combining these via
c(). The format() method collapses information about persons into
character vectors (one string for each person): the fields in
include are selected, each collapsed to a string using the
respective element of collapse and subsequently
“embraced” using the respective element of braces, and
finally collapsed into one string separated by white space. If
braces and/or collapse do not specify characters for all
fields, the defaults shown in the usage are imputed. The
print() method calls the format() method and prints the
result, the toBibtex() method creates a suitable BibTeX
representation.
Person objects can be subscripted by fields (using $) or by
position (using [).
as.person() is a generic function. Its default method tries to
reverse the default person formatting, and can also handle formatted
person entries collapsed by comma or "and" (with appropriate
white space).
Personal names are rather tricky, e.g.,
http://en.wikipedia.org/wiki/Personal_name.
The current implementation (starting from R 2.12.0) of the
"person" class uses the notions of given (including
middle names) and family names, as specified by given
and family respectively. Earlier versions used a scheme based
on first, middle and last names, as appropriate for most of Western
culture where the given name precedes the family name, but not
universal, as some other cultures place it after the family name, or
use no family name. To smooth the transition to the new scheme,
arguments first, middle and last are still
supported, but their use is deprecated and they must not be given in
combination with the corresponding new style arguments.
The new scheme also adds the possibility of specifying roles
based on a subset of the MARC Value List for Relators and Roles
(http://www.loc.gov/standards/sourcelist/relator-role.html).
When giving the roles of persons in the context of authoring R
packages, the following usage is suggested.
"aut"- (Author) Use for full authors who have made
substantial contributions to the package and should show up in the
package citation.
"com"(Compiler) Use for persons who collected code
(potentially in other languages) but did not make further
substantial contributions to the package.
"ctb"(Contributor) Use for authors who have made
smaller contributions (such as code patches etc.) but should not
show up in the package citation.
"cph"(Copyright holder) Use for all copyright holders.
"cre"(Creator) Use for the package maintainer.
"ths"(Thesis advisor) If the package is part of a
thesis, use for the thesis advisor.
"trl"(Translator) If the R code is a translation from
another language (typically S), use for the translator to R.
In the old scheme, person objects were used for single persons, and a
separate "personList" class with corresponding creator
personList() for collections of these. The new scheme employs
a single class for information about an arbitrary positive number of
persons, eliminating the need for the personList mechanism.