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30 lines
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<TITLE>CLHS: Section 19.2.2.2.3.1</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="19_bbbc.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="19_bbbc.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="19_bbc.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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19.2.2.2.3.1 Relation between component values NIL and :UNSPECIFIC</H2> <P>
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If a <A REL=DEFINITION HREF="26_glo_p.htm#pathname"><I>pathname</I></A> is converted to a <A REL=DEFINITION HREF="26_glo_n.htm#namestring"><I>namestring</I></A>, the <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbols</I></A> <A REL=DEFINITION HREF="a_nil.htm#nil"><B>nil</B></A> and <TT>:unspecific</TT> cause the field to be treated as if it were empty. That is, both <A REL=DEFINITION HREF="a_nil.htm#nil"><B>nil</B></A> and <TT>:unspecific</TT> cause the component not to appear in the <A REL=DEFINITION HREF="26_glo_n.htm#namestring"><I>namestring</I></A>. <P>
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However, when merging a <A REL=DEFINITION HREF="26_glo_p.htm#pathname"><I>pathname</I></A> with a set of defaults, only a <A REL=DEFINITION HREF="a_nil.htm#nil"><B>nil</B></A> value for a component will be replaced with the default for that component, while a value of <TT>:unspecific</TT> will be left alone as if the field were ``filled''; see the <A REL=DEFINITION HREF="26_glo_f.htm#function"><I>function</I></A> <A REL=DEFINITION HREF="f_merge_.htm#merge-pathnames"><B>merge-pathnames</B></A> and <A REL=CHILD HREF="19_bc.htm">Section 19.2.3 (Merging Pathnames)</A>. <P>
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<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/iss266.htm">PATHNAME-UNSPECIFIC-COMPONENT:NEW-TOKEN</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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