[lib] \xref may refer to standards other than C

Author: jensmaurer

source/lib-intro.tex

@@ -540,7 +540,7 @@
 
 \pnum
 Paragraphs labeled ``\textsc{See also}'' contain cross-references to the relevant portions
-of the ISO C standard.
+of other standards\iref{intro.refs}.
 
 \rSec2[conventions]{Other conventions}
 \indextext{conventions}%

source/regex.tex

@@ -696,22 +696,23 @@
 \tcode{ECMAScript} &
 Specifies that the grammar recognized by the regular expression engine
 shall be that used by ECMAScript in ECMA-262, as modified in~\ref{re.grammar}.
+\newline \xref ECMA-262 15.10
 \indextext{ECMAScript}%
 \indexlibrary{\idxcode{syntax_option_type}!\idxcode{ECMAScript}}%
 \\ \rowsep
 %
 \tcode{basic} &
 Specifies that the grammar recognized by the regular expression engine
-shall be that used by basic regular expressions in POSIX, Base Definitions and
-Headers, Section 9, Regular Expressions.
+shall be that used by basic regular expressions in POSIX.
+\newline \xref POSIX, Base Definitions and Headers, Section 9.3
 \indextext{POSIX!regular expressions}%
 \indexlibrary{\idxcode{syntax_option_type}!\idxcode{basic}}%
 \\ \rowsep
 %
 \tcode{extended} &
 Specifies that the grammar recognized by the regular expression engine
-shall be that used by extended regular expressions in POSIX, Base Definitions and
-Headers, Section 9, Regular Expressions.
+shall be that used by extended regular expressions in POSIX.
+\newline \xref POSIX, Base Definitions and Headers, Section 9.4
 \indextext{POSIX!extended regular expressions}%
 \indexlibrary{\idxcode{syntax_option_type}!\idxcode{extended}}%
 \\ \rowsep
@@ -4191,4 +4192,5 @@
 \indextext{regular expression traits!\idxcode{lookup_classname}}%
 \indextext{\idxcode{lookup_classname}!regular expression traits}%
 \end{itemize}
+\xref ECMA-262 15.10
 \indextext{regular expression|)}