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48 lines
6.9 KiB
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<!-- Common Lisp HyperSpec (TM), version 7.0 generated by Kent M. Pitman on Mon, 11-Apr-2005 2:31am EDT -->
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<TITLE>CLHS: Section 11.1.1</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="11_a.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="11_a.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="11_aaa.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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11.1.1 Introduction to Packages</H2> <P>
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A <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>package</I></A> establishes a mapping from names to <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbols</I></A>. At any given time, one <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>package</I></A> is current. The <A REL=DEFINITION HREF="26_glo_c.htm#current_package"><I>current package</I></A> is the one that is the <A REL=DEFINITION HREF="26_glo_v.htm#value"><I>value</I></A> of <A REL=DEFINITION HREF="v_pkg.htm#STpackageST"><B>*package*</B></A>. When using the <A REL=DEFINITION HREF="26_glo_l.htm#lisp_reader"><I>Lisp reader</I></A>, it is possible to refer to <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbols</I></A> in <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>packages</I></A> other than the current one through the use of <A REL=DEFINITION HREF="26_glo_p.htm#package_prefix"><I>package prefixes</I></A> in the printed representation of the <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A>. <P>
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The next figure lists some <A REL=DEFINITION HREF="26_glo_d.htm#defined_name"><I>defined names</I></A> that are applicable to <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>packages</I></A>. Where an <A REL=DEFINITION HREF="26_glo_o.htm#operator"><I>operator</I></A> takes an argument that is either a <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> or a <A REL=DEFINITION HREF="26_glo_l.htm#list"><I>list</I></A> of <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbols</I></A>, an argument of <A REL=DEFINITION HREF="a_nil.htm#nil"><B>nil</B></A> is treated as an empty <A REL=DEFINITION HREF="26_glo_l.htm#list"><I>list</I></A> of <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbols</I></A>. Any <I>package</I> argument may be either a <A REL=DEFINITION HREF="26_glo_s.htm#string"><I>string</I></A>, a <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A>, or a <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>package</I></A>. If a <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> is supplied, its name will be used as the <A REL=DEFINITION HREF="26_glo_p.htm#package"><I>package</I></A> name. <PRE>
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<A REL=DEFINITION HREF="v_module.htm#STmodulesST">*modules*</A> <A REL=DEFINITION HREF="f_import.htm#import">import</A> <A REL=DEFINITION HREF="f_provid.htm#provide">provide</A>
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<A REL=DEFINITION HREF="v_pkg.htm#STpackageST">*package*</A> <A REL=DEFINITION HREF="m_in_pkg.htm#in-package">in-package</A> <A REL=DEFINITION HREF="f_rn_pkg.htm#rename-package">rename-package</A>
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<A REL=DEFINITION HREF="m_defpkg.htm#defpackage">defpackage</A> <A REL=DEFINITION HREF="f_intern.htm#intern">intern</A> <A REL=DEFINITION HREF="f_provid.htm#require">require</A>
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<A REL=DEFINITION HREF="m_do_sym.htm#do-all-symbols">do-all-symbols</A> <A REL=DEFINITION HREF="f_list_a.htm#list-all-packages">list-all-packages</A> <A REL=DEFINITION HREF="f_shadow.htm#shadow">shadow</A>
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<A REL=DEFINITION HREF="m_do_sym.htm#do-external-symbols">do-external-symbols</A> <A REL=DEFINITION HREF="f_mk_pkg.htm#make-package">make-package</A> <A REL=DEFINITION HREF="f_shdw_i.htm#shadowing-import">shadowing-import</A>
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<A REL=DEFINITION HREF="m_do_sym.htm#do-symbols">do-symbols</A> <A REL=DEFINITION HREF="f_pkg_na.htm#package-name">package-name</A> <A REL=DEFINITION HREF="f_unexpo.htm#unexport">unexport</A>
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<A REL=DEFINITION HREF="f_export.htm#export">export</A> <A REL=DEFINITION HREF="f_pkg_ni.htm#package-nicknames">package-nicknames</A> <A REL=DEFINITION HREF="f_uninte.htm#unintern">unintern</A>
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<A REL=DEFINITION HREF="f_find_a.htm#find-all-symbols">find-all-symbols</A> <A REL=DEFINITION HREF="f_pkg_sh.htm#package-shadowing-symbols">package-shadowing-symbols</A> <A REL=DEFINITION HREF="f_unuse_.htm#unuse-package">unuse-package</A>
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<A REL=DEFINITION HREF="f_find_p.htm#find-package">find-package</A> <A REL=DEFINITION HREF="f_pkg_us.htm#package-use-list">package-use-list</A> <A REL=DEFINITION HREF="f_use_pk.htm#use-package">use-package</A>
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<A REL=DEFINITION HREF="f_find_s.htm#find-symbol">find-symbol</A> <A REL=DEFINITION HREF="f_pkg__1.htm#package-used-by-list">package-used-by-list</A>
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</PRE>
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<P><B>Figure 11-1. Some Defined Names related to Packages</B> <P>
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<A REL=CHILD HREF="11_aaa.htm"><H2>
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11.1.1.1 Package Names and Nicknames</H2></A><P>
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<A REL=CHILD HREF="11_aab.htm"><H2>
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11.1.1.2 Symbols in a Package</H2></A><P><P><HR>The following <A REL=META HREF="../Front/X3J13Iss.htm">X3J13 cleanup issue</A>, <I>not part of the specification</I>, applies to this section:<P><UL><LI> <A REL=CHILD HREF="../Issues/iss296.htm">REQUIRE-PATHNAME-DEFAULTS:ELIMINATE</A><P></UL><HR>
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<A REL=NAVIGATOR HREF="../Front/StartPts.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Starting Points]" SRC="../Graphics/StartPts.gif" ALIGN=Bottom></A><A REL=TOC HREF="../Front/Contents.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Contents]" SRC="../Graphics/Contents.gif" ALIGN=Bottom></A><A REL=INDEX HREF="../Front/X_Master.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Index]" SRC="../Graphics/Index.gif" ALIGN=Bottom></A><A REL=INDEX HREF="../Front/X_Symbol.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Symbols]" SRC="../Graphics/Symbols.gif" ALIGN=Bottom></A><A REL=GLOSSARY HREF="../Body/26_a.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Glossary]" SRC="../Graphics/Glossary.gif" ALIGN=Bottom></A><A HREF="../Front/X3J13Iss.htm"><IMG WIDTH=80 HEIGHT=40 ALT="[Issues]" SRC="../Graphics/Issues.gif" ALIGN=Bottom></A><BR>
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<A REL=COPYRIGHT HREF="../Front/Help.htm#Legal"><I>Copyright 1996-2005, LispWorks Ltd. All rights reserved.</I></A><P>
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