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31 lines
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<TITLE>CLHS: Section 2.4.6.1</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="02_df.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="02_df.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="02_dg.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Next]" SRC="../Graphics/Next.gif" ALIGN=Bottom></A></H1>
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2.4.6.1 Notes about Backquote</H2> <P>
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Since the exact manner in which the <A REL=DEFINITION HREF="26_glo_l.htm#lisp_reader"><I>Lisp reader</I></A> will parse an <A REL=DEFINITION HREF="26_glo_e.htm#expression"><I>expression</I></A> involving the <A REL=DEFINITION HREF="26_glo_b.htm#backquote"><I>backquote</I></A> <A REL=DEFINITION HREF="26_glo_r.htm#reader_macro"><I>reader macro</I></A> is not specified, an <A REL=DEFINITION HREF="26_glo_i.htm#implementation"><I>implementation</I></A> is free to choose any representation that preserves the semantics described. <P>
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Often an <A REL=DEFINITION HREF="26_glo_i.htm#implementation"><I>implementation</I></A> will choose a representation that facilitates pretty printing of the expression, so that <TT>(pprint `(a ,b))</TT> will display <TT>`(a ,b)</TT> and not, for example, <TT>(list 'a b)</TT>. However, this is not a requirement. <P>
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Implementors who have no particular reason to make one choice or another might wish to refer to <A REL=CITATION HREF="http://www.cs.indiana.edu/scheme-repository/doc.standards.html"><I>IEEE Standard for the Scheme Programming Language</I></A>, which identifies a popular choice of representation for such expressions that might provide useful to be useful compatibility for some user communities. There is no requirement, however, that any <A REL=DEFINITION HREF="26_glo_c.htm#conforming_implementation"><I>conforming implementation</I></A> use this particular representation. This information is provided merely for cross-reference purposes. <P>
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