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REFER(1) REFER(1)
NAME
refer - preprocess bibliographic references for groff
SYNOPSIS
refer [ -benvCPRS ] [ -an ] [ -cfields ] [ -fn ] [ -ifields ] [ -kfield ] [ -lm,n ] [ -pfilename ]
[ -sfields ] [ -tn ] [ -Bfield.macro ] [ filename... ]
It is possible to have whitespace between a command line option and its parameter.
DESCRIPTION
This file documents the GNU version of refer, which is part of the groff document formatting system.
refer copies the contents of filename... to the standard output, except that lines between .[ and .]
are interpreted as citations, and lines between .R1 and .R2 are interpreted as commands about how
citations are to be processed.
Each citation specifies a reference. The citation can specify a reference that is contained in a
bibliographic database by giving a set of keywords that only that reference contains. Alternatively
it can specify a reference by supplying a database record in the citation. A combination of these
alternatives is also possible.
For each citation, refer can produce a mark in the text. This mark consists of some label which can
be separated from the text and from other labels in various ways. For each reference it also outputs
groff commands that can be used by a macro package to produce a formatted reference for each cita-tion. citation.
tion. The output of refer must therefore be processed using a suitable macro package. The -ms and
-me macros are both suitable. The commands to format a citation's reference can be output immedi-ately immediately
ately after the citation, or the references may be accumulated, and the commands output at some later
point. If the references are accumulated, then multiple citations of the same reference will produce
a single formatted reference.
The interpretation of lines between .R1 and .R2 as commands is a new feature of GNU refer. Documents
making use of this feature can still be processed by Unix refer just by adding the lines
.de R1
.ig R2
..
to the beginning of the document. This will cause troff to ignore everything between .R1 and .R2.
The effect of some commands can also be achieved by options. These options are supported mainly for
compatibility with Unix refer. It is usually more convenient to use commands.
refer generates .lf lines so that filenames and line numbers in messages produced by commands that
read refer output will be correct; it also interprets lines beginning with .lf so that filenames and
line numbers in the messages and .lf lines that it produces will be accurate even if the input has
been preprocessed by a command such as soelim(1).
OPTIONS
Most options are equivalent to commands (for a description of these commands see the Commands subsec-tion): subsection):
tion):
-b no-label-in-text; no-label-in-reference
-e accumulate
-n no-default-database
-C compatible
-P move-punctuation
-S label "(A.n|Q) ', ' (D.y|D)"; bracket-label " (" ) "; "
-an reverse An
-cfields
capitalize fields
-fn label %n
-ifields
search-ignore fields
-k label L~%a
-kfield
label field~%a
-l label A.nD.y%a
-lm label A.n+mD.y%a
-l,n label A.nD.y-n%a
-lm,n label A.n+mD.y-n%a
-pfilename
database filename
-sspec sort spec
-tn search-truncate n
These options are equivalent to the following commands with the addition that the filenames specified
on the command line are processed as if they were arguments to the bibliography command instead of in
the normal way:
-B annotate X AP; no-label-in-reference
-Bfield.macro
annotate field macro; no-label-in-reference
The following options have no equivalent commands:
-v Print the version number.
-R Don't recognize lines beginning with .R1/.R2.
USAGE
Bibliographic databases
The bibliographic database is a text file consisting of records separated by one or more blank lines.
Within each record fields start with a % at the beginning of a line. Each field has a one character
name that immediately follows the %. It is best to use only upper and lower case letters for the
names of fields. The name of the field should be followed by exactly one space, and then by the con-tents contents
tents of the field. Empty fields are ignored. The conventional meaning of each field is as follows:
A The name of an author. If the name contains a title such as Jr. at the end, it should be sep-arated separated
arated from the last name by a comma. There can be multiple occurrences of the A field. The
order is significant. It is a good idea always to supply an A field or a Q field.
B For an article that is part of a book, the title of the book.
C The place (city) of publication.
D The date of publication. The year should be specified in full. If the month is specified,
the name rather than the number of the month should be used, but only the first three letters
are required. It is a good idea always to supply a D field; if the date is unknown, a value
such as in press or unknown can be used.
E For an article that is part of a book, the name of an editor of the book. Where the work has
editors and no authors, the names of the editors should be given as A fields and , (ed) or
, (eds) should be appended to the last author.
G US Government ordering number.
I The publisher (issuer).
J For an article in a journal, the name of the journal.
K Keywords to be used for searching.
L Label.
N Journal issue number.
O Other information. This is usually printed at the end of the reference.
P Page number. A range of pages can be specified as m-n.
Q The name of the author, if the author is not a person. This will only be used if there are no
A fields. There can only be one Q field.
R Technical report number.
S Series name.
T Title. For an article in a book or journal, this should be the title of the article.
V Volume number of the journal or book.
X Annotation.
For all fields except A and E, if there is more than one occurrence of a particular field in a
record, only the last such field will be used.
If accent strings are used, they should follow the character to be accented. This means that the AM
macro must be used with the -ms macros. Accent strings should not be quoted: use one \ rather than
two.
Citations
The format of a citation is
.[opening-text
flags keywords
fields
.]closing-text
The opening-text, closing-text and flags components are optional. Only one of the keywords and
fields components need be specified.
The keywords component says to search the bibliographic databases for a reference that contains all
the words in keywords. It is an error if more than one reference if found.
The fields components specifies additional fields to replace or supplement those specified in the
reference. When references are being accumulated and the keywords component is non-empty, then addi-tional additional
tional fields should be specified only on the first occasion that a particular reference is cited,
and will apply to all citations of that reference.
The opening-text and closing-text component specifies strings to be used to bracket the label instead
of the strings specified in the bracket-label command. If either of these components is non-empty,
the strings specified in the bracket-label command will not be used; this behaviour can be altered
using the [ and ] flags. Note that leading and trailing spaces are significant for these components.
The flags component is a list of non-alphanumeric characters each of which modifies the treatment of
this particular citation. Unix refer will treat these flags as part of the keywords and so will
ignore them since they are non-alphanumeric. The following flags are currently recognized:
# This says to use the label specified by the short-label command, instead of that specified by
the label command. If no short label has been specified, the normal label will be used. Typ-ically Typically
ically the short label is used with author-date labels and consists of only the date and pos-sibly possibly
sibly a disambiguating letter; the # is supposed to be suggestive of a numeric type of label.
[ Precede opening-text with the first string specified in the bracket-label command.
] Follow closing-text with the second string specified in the bracket-label command.
One advantages of using the [ and ] flags rather than including the brackets in opening-text and
closing-text is that you can change the style of bracket used in the document just by changing the
bracket-label command. Another advantage is that sorting and merging of citations will not necessar-ily necessarily
ily be inhibited if the flags are used.
If a label is to be inserted into the text, it will be attached to the line preceding the .[ line.
If there is no such line, then an extra line will be inserted before the .[ line and a warning will
be given.
There is no special notation for making a citation to multiple references. Just use a sequence of
citations, one for each reference. Don't put anything between the citations. The labels for all the
citations will be attached to the line preceding the first citation. The labels may also be sorted
or merged. See the description of the <> label expression, and of the sort-adjacent-labels and
abbreviate-label-ranges command. A label will not be merged if its citation has a non-empty opening-text openingtext
text or closing-text. However, the labels for a citation using the ] flag and without any closing-text closingtext
text immediately followed by a citation using the [ flag and without any opening-text may be sorted
and merged even though the first citation's opening-text or the second citation's closing-text is
non-empty. (If you wish to prevent this just make the first citation's closing-text \&.)
Commands
Commands are contained between lines starting with .R1 and .R2. Recognition of these lines can be
prevented by the -R option. When a .R1 line is recognized any accumulated references are flushed
out. Neither .R1 nor .R2 lines, nor anything between them is output.
Commands are separated by newlines or ;s. # introduces a comment that extends to the end of the line
(but does not conceal the newline). Each command is broken up into words. Words are separated by
spaces or tabs. A word that begins with " extends to the next " that is not followed by another ".
If there is no such " the word extends to the end of the line. Pairs of " in a word beginning with "
collapse to a single ". Neither # nor ; are recognized inside "s. A line can be continued by ending
it with \; this works everywhere except after a #.
Each command name that is marked with * has an associated negative command no-name that undoes the
effect of name. For example, the no-sort command specifies that references should not be sorted.
The negative commands take no arguments.
In the following description each argument must be a single word; field is used for a single upper or
lower case letter naming a field; fields is used for a sequence of such letters; m and n are used for
a non-negative numbers; string is used for an arbitrary string; filename is used for the name of a
file.
abbreviate* fields string1 string2 string3 string4
Abbreviate the first names of fields. An initial letter will be separated
from another initial letter by string1, from the last name by string2, and
from anything else (such as a von or de) by string3. These default to a
period followed by a space. In a hyphenated first name, the initial of the
first part of the name will be separated from the hyphen by string4; this
defaults to a period. No attempt is made to handle any ambiguities that
might result from abbreviation. Names are abbreviated before sorting and
before label construction.
abbreviate-label-ranges* string
Three or more adjacent labels that refer to consecutive references will be
abbreviated to a label consisting of the first label, followed by string
followed by the last label. This is mainly useful with numeric labels. If
string is omitted it defaults to -.
accumulate* Accumulate references instead of writing out each reference as it is encoun-tered. encountered.
tered. Accumulated references will be written out whenever a reference of
the form
.[
$LIST$
.]
is encountered, after all input files hve been processed, and whenever .R1
line is recognized.
annotate* field string field is an annotation; print it at the end of the reference as a paragraph
preceded by the line
.string
If macro is omitted it will default to AP; if field is also omitted it will
default to X. Only one field can be an annotation.
articles string... string... are definite or indefinite articles, and should be ignored at the
beginning of T fields when sorting. Initially, the, a and an are recognized
as articles.
bibliography filename... Write out all the references contained in the bibliographic databases file-name... filename...
name... This command should come last in a .R1/.R2 block.
bracket-label string1 string2 string3
In the text, bracket each label with string1 and string2. An occurrence of
string2 immediately followed by string1 will be turned into string3. The
default behaviour is
bracket-label \*([. \*(.] ", "
capitalize fields Convert fields to caps and small caps.
compatible* Recognize .R1 and .R2 even when followed by a character other than space or
newline.
database filename... Search the bibliographic databases filename... For each filename if an
index filename.i created by indxbib(1) exists, then it will be searched
instead; each index can cover multiple databases.
date-as-label* string string is a label expression that specifies a string with which to replace
the D field after constructing the label. See the Label expressions subsec-tion subsection
tion for a description of label expressions. This command is useful if you
do not want explicit labels in the reference list, but instead want to han-dle handle
dle any necessary disambiguation by qualifying the date in some way. The
label used in the text would typically be some combination of the author and
date. In most cases you should also use the no-label-in-reference command.
For example,
date-as-label D.+yD.y%a*D.-y
would attach a disambiguating letter to the year part of the D field in the
reference.
default-database* The default database should be searched. This is the default behaviour, so
the negative version of this command is more useful. refer determines
whether the default database should be searched on the first occasion that
it needs to do a search. Thus a no-default-database command must be given
before then, in order to be effective.
discard* fields When the reference is read, fields should be discarded; no string defini-tions definitions
tions for fields will be output. Initially, fields are XYZ.
et-al* string m n Control use of et al in the evaluation of @ expressions in label expres-sions. expressions.
sions. If the number of authors needed to make the author sequence unam-biguous unambiguous
biguous is u and the total number of authors is t then the last t-u authors
will be replaced by string provided that t-u is not less than m and t is not
less than n. The default behaviour is
et-al " et al" 2 3
include filename Include filename and interpret the contents as commands.
join-authors string1 string2 string3
This says how authors should be joined together. When there are exactly two
authors, they will be joined with string1. When there are more than two
authors, all but the last two will be joined with string2, and the last two
authors will be joined with string3. If string3 is omitted, it will default
to string1; if string2 is also omitted it will also default to string1. For
example,
join-authors " and " ", " ", and "
will restore the default method for joining authors.
label-in-reference* When outputting the reference, define the string [F to be the reference's
label. This is the default behaviour; so the negative version of this com-mand command
mand is more useful.
label-in-text* For each reference output a label in the text. The label will be separated
from the surrounding text as described in the bracket-label command. This
is the default behaviour; so the negative version of this command is more
useful.
label string string is a label expression describing how to label each reference.
separate-label-second-parts string
When merging two-part labels, separate the second part of the second label
from the first label with string. See the description of the <> label
expression.
move-punctuation* In the text, move any punctuation at the end of line past the label. It is
usually a good idea to give this command unless you are using superscripted
numbers as labels.
reverse* string Reverse the fields whose names are in string. Each field name can be fol-lowed followed
lowed by a number which says how many such fields should be reversed. If no
number is given for a field, all such fields will be reversed.
search-ignore* fields While searching for keys in databases for which no index exists, ignore the
contents of fields. Initially, fields XYZ are ignored.
search-truncate* n Only require the first n characters of keys to be given. In effect when
searching for a given key words in the database are truncated to the maximum
of n and the length of the key. Initially n is 6.
short-label* string string is a label expression that specifies an alternative (usually shorter)
style of label. This is used when the # flag is given in the citation.
When using author-date style labels, the identity of the author or authors
is sometimes clear from the context, and so it may be desirable to omit the
author or authors from the label. The short-label command will typically be
used to specify a label containing just a date and possibly a disambiguating
letter.
sort* string Sort references according to string. References will automatically be accu-mulated. accumulated.
mulated. string should be a list of field names, each followed by a number,
indicating how many fields with the name should be used for sorting. + can
be used to indicate that all the fields with the name should be used. Also
. can be used to indicate the references should be sorted using the (tenta-tive) (tentative)
tive) label. (The Label expressions subsection describes the concept of a
tentative label.)
sort-adjacent-labels* Sort labels that are adjacent in the text according to their position in the
reference list. This command should usually be given if the abbreviate-label-ranges abbreviatelabel-ranges
label-ranges command has been given, or if the label expression contains a
<> expression. This will have no effect unless references are being accumu-lated. accumulated.
lated.
Label expressions
Label expressions can be evaluated both normally and tentatively. The result of normal evaluation is
used for output. The result of tentative evaluation, called the tentative label, is used to gather
the information that normal evaluation needs to disambiguate the label. Label expressions specified
by the date-as-label and short-label commands are not evaluated tentatively. Normal and tentative
evaluation are the same for all types of expression other than @, *, and % expressions. The descrip-tion description
tion below applies to normal evaluation, except where otherwise specified.
field
field n
The n-th part of field. If n is omitted, it defaults to 1.
'string'
The characters in string literally.
@ All the authors joined as specified by the join-authors command. The whole of each author's
name will be used. However, if the references are sorted by author (that is the sort specifi-cation specification
cation starts with A+), then authors' last names will be used instead, provided that this does
not introduce ambiguity, and also an initial subsequence of the authors may be used instead of
all the authors, again provided that this does not introduce ambiguity. The use of only the
last name for the i-th author of some reference is considered to be ambiguous if there is some
other reference, such that the first i-1 authors of the references are the same, the i-th
authors are not the same, but the i-th authors' last names are the same. A proper initial
subsequence of the sequence of authors for some reference is considered to be ambiguous if
there is a reference with some other sequence of authors which also has that subsequence as a
proper initial subsequence. When an initial subsequence of authors is used, the remaining
authors are replaced by the string specified by the et-al command; this command may also spec-ify specify
ify additional requirements that must be met before an initial subsequence can be used. @
tentatively evaluates to a canonical representation of the authors, such that authors that
compare equally for sorting purpose will have the same representation.
%n
%a
%A
%i
%I The serial number of the reference formatted according to the character following the %. The
serial number of a reference is 1 plus the number of earlier references with same tentative
label as this reference. These expressions tentatively evaluate to an empty string.
expr* If there is another reference with the same tentative label as this reference, then expr, oth-erwise otherwise
erwise an empty string. It tentatively evaluates to an empty string.
expr+n
expr-n The first (+) or last (-) n upper or lower case letters or digits of expr. Troff special
characters (such as \('a) count as a single letter. Accent strings are retained but do not
count towards the total.
expr.l expr converted to lowercase.
expr.u expr converted to uppercase.
expr.c expr converted to caps and small caps.
expr.r expr reversed so that the last name is first.
expr.a expr with first names abbreviated. Note that fields specified in the abbreviate command are
abbreviated before any labels are evaluated. Thus .a is useful only when you want a field to
be abbreviated in a label but not in a reference.
expr.y The year part of expr.
expr.+y
The part of expr before the year, or the whole of expr if it does not contain a year.
expr.-y
The part of expr after the year, or an empty string if expr does not contain a year.
expr.n The last name part of expr.
expr1~expr2
expr1 except that if the last character of expr1 is - then it will be replaced by expr2.
expr1 expr2
The concatenation of expr1 and expr2.
expr1|expr2
If expr1 is non-empty then expr1 otherwise expr2.
expr1&expr2
If expr1 is non-empty then expr2 otherwise an empty string.
expr1?expr2:expr3
If expr1 is non-empty then expr2 otherwise expr3.
<expr> The label is in two parts, which are separated by expr. Two adjacent two-part labels which
have the same first part will be merged by appending the second part of the second label onto
the first label separated by the string specified in the separate-label-second-parts command
(initially, a comma followed by a space); the resulting label will also be a two-part label
with the same first part as before merging, and so additional labels can be merged into it.
Note that it is permissible for the first part to be empty; this maybe desirable for expres-sions expressions
sions used in the short-label command.
(expr) The same as expr. Used for grouping.
The above expressions are listed in order of precedence (highest first); & and | have the same prece-dence. precedence.
dence.
Macro interface
Each reference starts with a call to the macro ]-. The string [F will be defined to be the label for
this reference, unless the no-label-in-reference command has been given. There then follows a series
of string definitions, one for each field: string [X corresponds to field X. The number register [P
is set to 1 if the P field contains a range of pages. The [T, [A and [O number registers are set
to 1 according as the T, A and O fields end with one of the characters .?!. The [E number register
will be set to 1 if the [E string contains more than one name. The reference is followed by a call
to the ][ macro. The first argument to this macro gives a number representing the type of the refer-ence. reference.
ence. If a reference contains a J field, it will be classified as type 1, otherwise if it contains a
B field, it will type 3, otherwise if it contains a G or R field it will be type 4, otherwise if con-tains contains
tains a I field it will be type 2, otherwise it will be type 0. The second argument is a symbolic
name for the type: other, journal-article, book, article-in-book or tech-report. Groups of refer-ences references
ences that have been accumulated or are produced by the bibliography command are preceded by a call
to the ]< macro and followed by a call to the ]> macro.
FILES
/usr/dict/papers/Ind Default database.
file.i Index files.
ENVIRONMENT
REFER If set, overrides the default database.
SEE ALSO
indxbib(1), lookbib(1), lkbib(1)
BUGS
In label expressions, <> expressions are ignored inside .char expressions.
Groff Version 1.19.2 6 May 2005 REFER(1)
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