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+%D \module
+%D   [       file=publ-imp-cite,
+%D        version=2013.12.24,
+%D          title=\CONTEXT\ Publication Support,
+%D       subtitle=Citations,
+%D         author=Alan Braslau and Hans Hagen,
+%D           date=\currentdate,
+%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
+%C
+%C This module is part of the \CONTEXT\ macro||package and is
+%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
+%C details.
+
+\unprotect
+
+\starttexdefinition btx:cite:inject #content
+    \ifconditional\btxinteractive
+        \ifx\currentbtxinternal\empty
+            #content
+        \else
+            \goto {
+                #content
+            } [
+                \s!internal(\currentbtxinternal)
+            ]
+        \fi
+    \else
+        #content
+    \fi
+\stoptexdefinition
+
+\starttexdefinition btx:cite:checkconcat
+    \ifnum\currentbtxcount>\zerocount
+        \let\currentbtxinternal\empty
+        \let\currentbtxbacklink\empty
+    \fi
+\stoptexdefinition
+
+% The null case:
+
+\startsetups btx:cite:none
+    \btxcitereference
+    % dummy
+\stopsetups
+
+\startsetups btx:cite:nocite
+    \dontleavehmode
+    \btxcitereference
+\stopsetups
+
+\startsetups btx:cite:unknown
+    \begingroup
+        \tttf
+        \btxcitereference
+        \currentbtxfirst
+    \endgroup
+\stopsetups
+
+\startsetups btx:cite:empty
+    \btxcitereference
+    <empty>
+\stopsetups
+
+\startsetups btx:cite:invalid
+     \btxcitereference
+     {\tt <\currentbtxreference>}
+\stopsetups
+
+\starttexdefinition btx:cite:concat
+    \btxparameter{\c!separator:\number\currentbtxconcat}
+\stoptexdefinition
+
+% when we have an author-year combination, the first and seconds is not
+% fields data but something more complex (that itself calls for a setup)
+
+% \startsetups btx:cite:normal
+%     \texdefinition{\s!btx:\s!cite:concat}
+%     \currentbtxlefttext
+%     \ifx\currentbtxfirst\empty
+%         \fastsetup{\s!btx:\s!cite:\s!empty}
+%     \else
+%         \texdefinition {\s!btx:\s!cite:inject} {
+%             \btxcitereference
+%             \btxusecommand [\currentbtxspecification:cite:\currentbtxcitealternative] {
+%                 \currentbtxfirst
+%             }
+%         }
+%         \ifx\currentbtxsecond\empty
+%           \btxflushsuffix
+%         \else
+%             \btxparameter\c!inbetween
+%             \texdefinition {\s!btx:\s!cite:inject} {
+%                 \btxusecommand [\currentbtxspecification:cite:\currentbtxcitealternative] {
+%                     \currentbtxsecond
+%                  }
+%             }
+%             % quite likely an error
+%             \btxflushsuffix
+%         \fi
+%     \fi
+%     \currentbtxrighttext
+% \stopsetups
+
+\startsetups btx:cite:normal
+    \texdefinition{\s!btx:\s!cite:concat}
+    \currentbtxlefttext
+    \ifx\currentbtxfirst\empty
+        \fastsetup{\s!btx:\s!cite:\s!empty}
+    \else\ifx\currentbtxsecond\empty
+        \texdefinition {\s!btx:\s!cite:inject} {
+            \btxcitereference
+            \btxusecommand [\currentbtxspecification:cite:\currentbtxcitealternative] {
+                \currentbtxfirst
+                \btxflushsuffix
+            }
+        }
+    \else
+      %  \texdefinition {\s!btx:\s!cite:inject} {
+      %      \btxcitereference
+      %      \btxusecommand [\currentbtxspecification:cite:\currentbtxcitealternative] {
+      %          \currentbtxfirst
+      %      }
+      %  }
+      %  \btxparameter\c!inbetween
+      %  \texdefinition {\s!btx:\s!cite:inject} {
+      %      \btxusecommand [\currentbtxspecification:cite:\currentbtxcitealternative] {
+      %          \currentbtxsecond
+      %       }
+      %  }
+      %  \btxflushsuffix
+      %
+      % probably better:
+        \texdefinition {\s!btx:\s!cite:inject} {
+            \btxcitereference
+            \btxusecommand [\currentbtxspecification:cite:\currentbtxcitealternative] {
+                \currentbtxfirst
+                \btxparameter\c!inbetween
+                \currentbtxsecond
+                \btxflushsuffix
+             }
+        }
+    \fi\fi
+    \currentbtxrighttext
+\stopsetups
+
+
+\startsetups btx:cite:range
+    \texdefinition{\s!btx:\s!cite:concat}
+    \currentbtxlefttext
+    \ifx\currentbtxfirst\empty
+        \fastsetup{\s!btx:\s!cite:\s!empty}
+    \else
+        \texdefinition {\s!btx:\s!cite:inject} {
+            \btxcitereference
+            \btxusecommand [\currentbtxspecification:cite:\currentbtxcitealternative] {
+                \currentbtxfirst
+                \ifx\currentbtxsecond\empty \else
+                    \btxparameter\c!range
+                    \currentbtxsecond
+                \fi
+                \btxflushsuffix
+            }
+        }
+    \fi
+    \currentbtxrighttext
+\stopsetups
+
+% somehow related to keywords:
+
+\startsetups btx:cite:listelement
+    \texdefinition{\s!btx:\s!cite:concat}
+    \currentbtxlefttext
+    \ifx\currentbtxfirst\empty
+        \fastsetup{\s!btx:\s!cite:\s!empty}
+    \else
+       \texdefinition {\s!btx:\s!cite:inject} {
+           \btxcitereference
+           \currentbtxfirst
+       }
+    \fi
+    \currentbtxrighttext
+\stopsetups
+
+\startsetups \s!btx:\s!cite:entry
+    \texdefinition{\s!btx:\s!cite:concat}
+    \currentbtxlefttext
+    \btxhandleciteentry
+    \currentbtxrighttext
+\stopsetups
+
+% these three are goodies to get something but are not set up as it makes no
+% sense to have something root for combinations like this (esp not because one
+% gets default anyway
+
+% AB: not so sure about that. Why define them in default rather than here?
+
+\startsetups \s!btx:\s!cite:author
+    \fastsetup{\s!btx:\s!cite:normal}
+\stopsetups
+\startsetups \s!btx:\s!cite:authoryear
+    \fastsetup{\s!btx:\s!cite:normal}
+\stopsetups
+\startsetups \s!btx:\s!cite:authoryears
+    \fastsetup{\s!btx:\s!cite:normal}
+\stopsetups
+\startsetups \s!btx:\s!cite:authornum
+    \fastsetup{\s!btx:\s!cite:normal}
+\stopsetups
+\startsetups \s!btx:\s!cite:num
+    \fastsetup{\s!btx:\s!cite:range}
+\stopsetups
+\startsetups \s!btx:\s!cite:default
+    \fastsetup{\s!btx:\s!cite:num}
+\stopsetups
+\startsetups \s!btx:\s!cite:textnum
+    \fastsetup{\s!btx:\s!cite:num}
+\stopsetups
+\startsetups \s!btx:\s!cite:year
+    \fastsetup{\s!btx:\s!cite:range}
+\stopsetups
+\startsetups \s!btx:\s!cite:author:num
+    \fastsetup{\s!btx:\s!cite:range}
+\stopsetups
+\startsetups \s!btx:\s!cite:author:year
+    \fastsetup{\s!btx:\s!cite:range}
+\stopsetups
+\startsetups \s!btx:\s!cite:author:years
+    \fastsetup{\s!btx:\s!cite:range}
+\stopsetups
+
+\startsetups \s!btx:\s!cite:index
+    \fastsetup{\s!btx:\s!cite:range}
+\stopsetups
+\startsetups \s!btx:\s!cite:category
+    \fastsetup{\s!btx:\s!cite:normal}
+\stopsetups
+\startsetups \s!btx:\s!cite:short
+    \fastsetup{\s!btx:\s!cite:normal}
+\stopsetups
+\startsetups \s!btx:\s!cite:tag
+    \fastsetup{\s!btx:\s!cite:normal}
+\stopsetups
+
+% the following correspond to fields, but can be used in many renderings
+
+\startsetups \s!btx:\s!cite:keywords
+    \fastsetup{\s!btx:\s!cite:list}
+\stopsetups
+\startsetups \s!btx:\s!cite:title
+    \fastsetup{\s!btx:\s!cite:normal}
+\stopsetups
+\startsetups \s!btx:\s!cite:pages
+    \fastsetup{\s!btx:\s!cite:range}
+\stopsetups
+
+% is the next one used?
+% Yes, bibtex is a mess and one can have pages or sometimes page
+
+\startsetups \s!btx:\s!cite:page
+    \fastsetup{\s!btx:\s!cite:normal}
+\stopsetups
+
+% the following is kind of specific, but can be used in many renderings
+
+\startsetups btx:cite:url
+    \ifx\currentbtxfirst\empty
+        \fastsetup{\s!btx:\s!cite:\s!empty}
+    \else\ifconditional\btxinteractive
+        \goto {
+            \btxcitereference
+            \hyphenatedurl{\doif{\currentbtxcitealternative}{doi}{doi:}\currentbtxfirst}
+        } [
+            url(\doif{\currentbtxcitealternative}{doi}{http://dx.doi.org/}\currentbtxfirst)
+        ]
+    \else
+        \btxcitereference
+        \hyphenatedurl{\doif{\currentbtxcitealternative}{doi}{doi:}\currentbtxfirst}
+    \fi\fi
+\stopsetups
+
+\protect