DSSSL Library Reference: Part of the Modular DocBook Stylesheet distribution
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# node-list-filter-by-gi

## Name

node-list-filter-by-gi -- Returns selected elements from a node list

## Synopsis

    (node-list-filter-by-gi nodelist gilist)

## Description

Returns a node list containing all the nodes from `nodelist` whose GIs are members of `gilist`. The order of nodes in the node list is preserved.

## Author

Norman Walsh, <ndw@nwalsh.com>

## Source Code

    (define (node-list-filter-by-gi nodelist gilist)
      ;; Returns selected elements from a node list
      (let loop ((result (empty-node-list)) (nl nodelist))
        (if (node-list-empty? nl)
    	result
    	(if (member (gi (node-list-first nl)) gilist)
    	    (loop (node-list result (node-list-first nl))
    		  (node-list-rest nl))
    	    (loop result (node-list-rest nl))))))

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