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31 lines
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<TITLE>CLHS: Section 3.2.4.3</TITLE>
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<H1><A REV=MADE HREF="http://www.lispworks.com/"><IMG WIDTH=80 HEIGHT=65 ALT="[LISPWORKS]" SRC="../Graphics/LWSmall.gif" ALIGN=Bottom></A><A REL=TOP HREF="../Front/index.htm"><IMG WIDTH=237 HEIGHT=65 ALT="[Common Lisp HyperSpec (TM)]" SRC="../Graphics/CLHS_Sm.gif" ALIGN=Bottom></A> <A REL=PREV HREF="03_bdbb.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="03_bd.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="03_bdd.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Next]" SRC="../Graphics/Next.gif" ALIGN=Bottom></A></H1>
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<H2>
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3.2.4.3 Extensions to Similarity Rules</H2> <P>
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Some <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>objects</I></A>, such as <A REL=DEFINITION HREF="26_glo_s.htm#stream"><I>streams</I></A>, <B>readtables</B>, and <B>methods</B> are not <A REL=DEFINITION HREF="26_glo_e.htm#externalizable_object"><I>externalizable objects</I></A> under the definition of similarity given above. That is, such <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>objects</I></A> may not portably appear as <A REL=DEFINITION HREF="26_glo_l.htm#literal"><I>literal</I></A> <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>objects</I></A> in <A REL=DEFINITION HREF="26_glo_c.htm#code"><I>code</I></A> to be processed by the <A REL=DEFINITION HREF="26_glo_f.htm#file_compiler"><I>file compiler</I></A>. <P>
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An <A REL=DEFINITION HREF="26_glo_i.htm#implementation"><I>implementation</I></A> is permitted to extend the rules of similarity, so that other kinds of <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>objects</I></A> are <A REL=DEFINITION HREF="26_glo_e.htm#externalizable_object"><I>externalizable objects</I></A> for that <A REL=DEFINITION HREF="26_glo_i.htm#implementation"><I>implementation</I></A>. <P>
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If for some kind of <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>object</I></A>, <A REL=DEFINITION HREF="26_glo_s.htm#similarity"><I>similarity</I></A> is neither defined by this specification nor by the <A REL=DEFINITION HREF="26_glo_i.htm#implementation"><I>implementation</I></A>, then the <A REL=DEFINITION HREF="26_glo_f.htm#file_compiler"><I>file compiler</I></A> must signal an error upon encountering such an <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>object</I></A> as a <A REL=DEFINITION HREF="26_glo_l.htm#literal"><I>literal</I></A> <A REL=DEFINITION HREF="26_glo_c.htm#constant"><I>constant</I></A>. <P>
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