ntheorem.pdf. - Mirrors.med.harvard.edu

Original syntax: \newlabel{〈label〉}{{〈section〉}{〈page〉}}
Modified syntax: \newlabel{〈label〉} {{〈section〉}{〈page〉}}[〈type〉]
Definition of \newlabel: \def\newlabel{\@newl@bel r}.
Therefore, the modification is encoded into the \@newl@bel macro:
221 \def\@newl@bel#1#2#3{%
222 \@ifpackageloaded{babel}{\@safe@activestrue}\relax%
223 \@ifundefined{#1@#2}%
224 \relax
225 {\gdef \@multiplelabels {%
226 \@latex@warning@no@line{There were multiply-defined labels}}%
227 \@latex@warning@no@line{Label ‘#2’ multiply defined}}%
228 \global\@namedef{#1@#2}{#3}%
229 \@ifnextchar[{\set@label@type{#1}{#2}}%]
230 \relax}%
231 \def\set@label@type#1#2[#3]{%
232 \global\@namedef{#1@#2@type}{#3}}
the macro is called with three arguments (same as originally):
#1=r,
〈labelname〉 := #2 is the label name,
#3 is a pair (section, page-number) consisting of the values needed for \ref
and \pageref, respectively.
Line 222: adaptation to babel
Lines 223–228: The original definition (both standard L ATEX and babel).
Line 229: if an optional argument follows (containing the environment-type),
continue with \set@label@type, otherwise return (the original behavior).
Lines 231, 232: set \r@〈labelname〉@type to the type of the respective environment.
\thref \thref is an adaptation of \ref:
233 \def\thref#1{%
234 \expandafter\ifx\csname r@#1@type\endcsname\None
235 \PackageWarning{\basename}{thref: Reference Type of ‘#1’ on page
236 \thepage \space undefined}\G@refundefinedtrue
237 \else\csname r@#1@type\endcsname~\fi
238 \expandafter\@setref\csname r@#1\endcsname\@firstoftwo{#1}}
Lines 233, 238: similar to \ref.
Line 222: if a legal theorem type is given, then output \r@〈labelname〉@type
and avoid linebreaking between the type and the number.
\testdef A problem occurred, when about 250 labels to theorem-like environments
have been defined: after the end of a document, the .aux file is read once
more (to check if references changed). Here, L ATEX redefines \@newl@bel
into \@testdef – and L ATEX does not know that ntheorem’s \label has an
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