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

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<H2><A NAME="sec:10.1"><SPAN class="sec-nr">10.1</SPAN> <SPAN class="sec-title">Limitations 
of qsave_program</SPAN></A></H2>

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

<P>There are three areas that require special attention when using
<A NAME="idx:qsaveprogram12:1540"></A><A class="pred" href="runtime.html#qsave_program/1">qsave_program/[1,2]</A>.

<P>
<UL class="latex">
<LI>If the program is an embedded Prolog application or uses the foreign 
language interface, care has to be taken to restore the appropriate 
foreign context. See <A class="sec" href="qsaveforeign.html">section 
10.2</A> for details.

<P>
<LI>If the program uses directives (<CODE>:- goal.</CODE> lines) that 
perform other actions then setting predicate attributes (dynamic, 
volatile, etc.) or loading files (consult, etc.), the directive may need 
to be prefixed with <A NAME="idx:initialization1:1541"></A><A class="pred" href="consulting.html#initialization/1">initialization/1</A>.

<P>
<LI>Database references as returned by <A NAME="idx:clause3:1542"></A><A class="pred" href="examineprog.html#clause/3">clause/3</A>, <A NAME="idx:recorded3:1543"></A><A class="pred" href="db.html#recorded/3">recorded/3</A>, 
etc. are not preserved and may thus not be part of the database when 
saved.
</UL>

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