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docbook-style-dsssl-doc-1.79-16.mga7.noarch.rpm

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NAME="COMPONENT-LIST-CHILD-NUMBER"
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>component-list-child-number</H1
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><A
NAME="AEN1217"
></A
><H2
>Name</H2
>component-list-child-number&nbsp;--&nbsp;Find child-number of a list of children within a component</DIV
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NAME="AEN1220"
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>Synopsis</H2
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CLASS="SYNOPSIS"
>(component-list-child-number inputnd inputlist complist)</PRE
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NAME="AEN1223"
></A
><H2
>Description</H2
><P
>Finds the first ancestor of <TT
CLASS="LITERAL"
>inputnd</TT
> in <TT
CLASS="LITERAL"
>complist</TT
> and
then counts all the elements of the types in <TT
CLASS="LITERAL"
>inputlist</TT
>
from that point on and returns the number of <TT
CLASS="LITERAL"
>inputnd</TT
>.</P
><P
>If the node is not found, 0 is returned.</P
><P
>WARNING: this requires walking over *all* the descendants
of the ancestor node. This may be *slow*.</P
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><A
NAME="AEN1232"
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><H2
>Author</H2
><P
>Norman Walsh, &lt;ndw@nwalsh.com&gt;</P
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NAME="AEN1235"
></A
><H2
>Source Code</H2
><PRE
CLASS="PROGRAMLISTING"
>(define (component-list-child-number inputnd inputlist complist)
  ;; Find child-number of a list of children within a component
    (let loop ((nl (component-list-descendant-node-list
		    inputnd inputlist complist))
	       (num 1))
      (if (node-list-empty? nl)
	  0
	  (if (node-list=? (node-list-first nl) inputnd)
	      num
	      (loop (node-list-rest nl) (+ num 1))))))</PRE
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