/usr/lib/swi-prolog/doc/Manual/charconv.html

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<H2><A NAME="sec:4.24"><SPAN class="sec-nr">4.24</SPAN> <SPAN class="sec-title">Character 
Conversion</SPAN></A></H2>

<A NAME="sec:charconv"></A>

<P>Although I wouldn't really know for what you would like to use these 
features, they are provided for ISO compliance.

<DL class="latex">
<DT class="pubdef"><span class="pred-tag">[ISO]</span><A NAME="char_conversion/2"><STRONG>char_conversion</STRONG>(<VAR>+CharIn, 
+CharOut</VAR>)</A></DT>
<DD class="defbody">
Define that term-input (see <A NAME="idx:readterm3:1001"></A><A class="pred" href="termrw.html#read_term/3">read_term/3</A>) 
maps each character read as
<VAR>CharIn</VAR> to the character <VAR>CharOut</VAR>. Character 
conversion is only executed if the Prolog flag <A class="flag" href="flags.html#flag:char_conversion">char_conversion</A> 
is set to
<CODE>true</CODE> and not inside quoted atoms or strings. The initial 
table maps each character onto itself. See also <A NAME="idx:currentcharconversion2:1002"></A><A class="pred" href="charconv.html#current_char_conversion/2">current_char_conversion/2</A>.
</DD>
<DT class="pubdef"><span class="pred-tag">[ISO]</span><A NAME="current_char_conversion/2"><STRONG>current_char_conversion</STRONG>(<VAR>?CharIn, 
?CharOut</VAR>)</A></DT>
<DD class="defbody">
Queries the current character conversion-table. See <A NAME="idx:charconversion2:1003"></A><A class="pred" href="charconv.html#char_conversion/2">char_conversion/2</A> 
for details.
</DD>
</DL>

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