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Ellipses in Patterns

As in syntax-rules, ellipses may be used to specify a repeated pattern. Note that the pattern item ... specifies zero-or-more matches of the pattern item.

The use of ellipses in a pattern is illustrated in the code fragment below, where nested ellipses are used to match the children of repeated instances of an a element, within an element d.

(define x '(d (a 1 2 3) (a 4 5) (a 6 7 8) (a 9 10)))

(sxml-match x
  [(d (a ,b ...) ...)
   (list (list b ...) ...)])

The above expression returns a value of ((1 2 3) (4 5) (6 7 8) (9 10)).


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