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44 lines
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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 3.1.1</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="03_a.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="03_a.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="03_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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3.1.1 Introduction to Environments</H2> <P>
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A <A REL=DEFINITION HREF="26_glo_b.htm#binding"><I>binding</I></A> is an association between a <A REL=DEFINITION HREF="26_glo_n.htm#name"><I>name</I></A> and that which the name denotes. <A REL=DEFINITION HREF="26_glo_b.htm#binding"><I>Bindings</I></A> are <I>established</I> in a <A REL=DEFINITION HREF="26_glo_l.htm#lexical_environment"><I>lexical environment</I></A> or a <A REL=DEFINITION HREF="26_glo_d.htm#dynamic_environment"><I>dynamic environment</I></A> by particular <A REL=DEFINITION HREF="26_glo_s.htm#special_operator"><I>special operators</I></A>. <P>
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An <A REL=DEFINITION HREF="26_glo_e.htm#environment"><I>environment</I></A> is a set of <A REL=DEFINITION HREF="26_glo_b.htm#binding"><I>bindings</I></A> and other information used during evaluation (e.g., to associate meanings with names). <P>
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<A REL=DEFINITION HREF="26_glo_b.htm#binding"><I>Bindings</I></A> in an <A REL=DEFINITION HREF="26_glo_e.htm#environment"><I>environment</I></A> are partitioned into <A REL=DEFINITION HREF="26_glo_n.htm#namespace"><I>namespaces</I></A>. A single <A REL=DEFINITION HREF="26_glo_n.htm#name"><I>name</I></A> can simultaneously have more than one associated <A REL=DEFINITION HREF="26_glo_b.htm#binding"><I>binding</I></A> per <A REL=DEFINITION HREF="26_glo_e.htm#environment"><I>environment</I></A>, but can have only one associated <A REL=DEFINITION HREF="26_glo_b.htm#binding"><I>binding</I></A> per <A REL=DEFINITION HREF="26_glo_n.htm#namespace"><I>namespace</I></A>. <P>
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<A REL=CHILD HREF="03_aaa.htm"><H2>
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3.1.1.1 The Global Environment</H2></A><P>
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<A REL=CHILD HREF="03_aab.htm"><H2>
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3.1.1.2 Dynamic Environments</H2></A><P>
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<A REL=CHILD HREF="03_aac.htm"><H2>
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3.1.1.3 Lexical Environments</H2></A><P>
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<A REL=CHILD HREF="03_aad.htm"><H2>
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3.1.1.4 Environment Objects</H2></A><P><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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