39 lines
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39 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 4.2.2</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="04_ba.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="04_b.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="04_bc.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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4.2.2 Type Relationships</H2> <P>
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<P><DL><P>
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<DT>* The <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>types</I></A> <A REL=DEFINITION HREF="t_cons.htm#cons"><B>cons</B></A>, <A REL=DEFINITION HREF="t_symbol.htm#symbol"><B>symbol</B></A>, <A REL=DEFINITION HREF="t_array.htm#array"><B>array</B></A>, <A REL=DEFINITION HREF="t_number.htm#number"><B>number</B></A>, <A REL=DEFINITION HREF="t_ch.htm#character"><B>character</B></A>, <A REL=DEFINITION HREF="t_hash_t.htm#hash-table"><B>hash-table</B></A>, <A REL=DEFINITION HREF="t_fn.htm#function"><B>function</B></A>, <A REL=DEFINITION HREF="t_rdtabl.htm#readtable"><B>readtable</B></A>, <A REL=DEFINITION HREF="t_pkg.htm#package"><B>package</B></A>, <A REL=DEFINITION HREF="t_pn.htm#pathname"><B>pathname</B></A>, <A REL=DEFINITION HREF="t_stream.htm#stream"><B>stream</B></A>, <A REL=DEFINITION HREF="t_rnd_st.htm#random-state"><B>random-state</B></A>, <A REL=DEFINITION HREF="e_cnd.htm#condition"><B>condition</B></A>, <A REL=DEFINITION HREF="t_rst.htm#restart"><B>restart</B></A>, and any single other <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> created by <A REL=DEFINITION HREF="m_defstr.htm#defstruct"><B>defstruct</B></A>, <A REL=DEFINITION HREF="m_defi_5.htm#define-condition"><B>define-condition</B></A>, or <A REL=DEFINITION HREF="m_defcla.htm#defclass"><B>defclass</B></A> are <A REL=DEFINITION HREF="26_glo_p.htm#pairwise"><I>pairwise</I></A> <A REL=DEFINITION HREF="26_glo_d.htm#disjoint"><I>disjoint</I></A>, except for type relations explicitly established by specifying <A REL=DEFINITION HREF="26_glo_s.htm#superclass"><I>superclasses</I></A> in <A REL=DEFINITION HREF="m_defcla.htm#defclass"><B>defclass</B></A> or <A REL=DEFINITION HREF="m_defi_5.htm#define-condition"><B>define-condition</B></A> or the <TT>:include</TT> option of <B>destruct</B>. <P><DD>
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<P>
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<P>
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<DT>* Any two <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>types</I></A> created by <A REL=DEFINITION HREF="m_defstr.htm#defstruct"><B>defstruct</B></A> are <A REL=DEFINITION HREF="26_glo_d.htm#disjoint"><I>disjoint</I></A> unless one is a <A REL=DEFINITION HREF="26_glo_s.htm#supertype"><I>supertype</I></A> of the other by virtue of the <A REL=DEFINITION HREF="m_defstr.htm#defstruct"><B>defstruct</B></A> <TT>:include</TT> option. <P><DD>
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<P>
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<DT>* Any two <A REL=DEFINITION HREF="26_glo_d.htm#distinct"><I>distinct</I></A> <A REL=DEFINITION HREF="26_glo_c.htm#class"><I>classes</I></A> created by <A REL=DEFINITION HREF="m_defcla.htm#defclass"><B>defclass</B></A> or <A REL=DEFINITION HREF="m_defi_5.htm#define-condition"><B>define-condition</B></A> are <A REL=DEFINITION HREF="26_glo_d.htm#disjoint"><I>disjoint</I></A> unless they have a common <A REL=DEFINITION HREF="26_glo_s.htm#subclass"><I>subclass</I></A> or one <A REL=DEFINITION HREF="26_glo_c.htm#class"><I>class</I></A> is a <A REL=DEFINITION HREF="26_glo_s.htm#subclass"><I>subclass</I></A> of the other. <P><DD>
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<P>
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<DT>* An implementation may be extended to add other <A REL=DEFINITION HREF="26_glo_s.htm#subtype"><I>subtype</I></A> relationships between the specified <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>types</I></A>, as long as they do not violate the type relationships and disjointness requirements specified here. An implementation may define additional <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>types</I></A> that are <A REL=DEFINITION HREF="26_glo_s.htm#subtype"><I>subtypes</I></A> or <A REL=DEFINITION HREF="26_glo_s.htm#supertype"><I>supertypes</I></A> of any specified <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>types</I></A>, as long as each additional <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> is a <A REL=DEFINITION HREF="26_glo_s.htm#subtype"><I>subtype</I></A> of <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> <A REL=DEFINITION HREF="t_t.htm#t"><B>t</B></A> and a <A REL=DEFINITION HREF="26_glo_s.htm#supertype"><I>supertype</I></A> of <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> <A REL=DEFINITION HREF="t_nil.htm#nil"><B>nil</B></A> and the disjointness requirements are not violated. <P><DD>
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At the discretion of the implementation, either <A REL=DEFINITION HREF="t_std_ob.htm#standard-object"><B>standard-object</B></A> or <A REL=DEFINITION HREF="t_stu_ob.htm#structure-object"><B>structure-object</B></A> might appear in any class precedence list for a <A REL=DEFINITION HREF="26_glo_s.htm#system_class"><I>system class</I></A> that does not already specify either <A REL=DEFINITION HREF="t_std_ob.htm#standard-object"><B>standard-object</B></A> or <A REL=DEFINITION HREF="t_stu_ob.htm#structure-object"><B>structure-object</B></A>. If it does, it must precede the <A REL=DEFINITION HREF="26_glo_c.htm#class"><I>class</I></A> <A REL=DEFINITION HREF="t_t.htm#t"><B>t</B></A> and follow all other <A REL=DEFINITION HREF="26_glo_s.htm#standardized"><I>standardized</I></A> <A REL=DEFINITION HREF="26_glo_c.htm#class"><I>classes</I></A>. <P>
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<P></DL><P>
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<P><HR>The following <A REL=META HREF="../Front/X3J13Iss.htm">X3J13 cleanup issues</A>, <I>not part of the specification</I>, apply to this section:<P><UL><LI> <A REL=CHILD HREF="../Issues/iss057.htm">COMMON-TYPE:REMOVE</A><LI> <A REL=CHILD HREF="../Issues/iss049.htm">CLOS-CONDITIONS:INTEGRATE</A><LI> <A REL=CHILD HREF="../Issues/iss351.htm">TYPE-OF-AND-PREDEFINED-CLASSES:UNIFY-AND-EXTEND</A><LI> <A REL=CHILD HREF="../Issues/iss179.htm">FUNCTION-TYPE:X3J13-MARCH-88</A><LI> <A REL=CHILD HREF="../Issues/iss090.htm">DATA-TYPES-HIERARCHY-UNDERSPECIFIED</A><P></UL><HR>
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