Subject: Re: Issues with literate programming DSSSL Script From: Brandon Ibach <bibach@xxxxxxxxxxxxxx> Date: Fri, 17 Dec 1999 13:09:06 -0600 |
Quoting Wroth, Mark <MARK.WROTH@xxxxxxxxxxx>: > On a related note: what's wrong with this selector? > > (with-mode continuation > (process-node-list > (select-elements (descendants (document-element (current-node))) > '(scrap (continues attribute-string "id"))))) > Try this, instead: `(scrap (continues ,(attribute-string "id"))) The problem here is that the single quote in your version quoted the *entire* expression, meaning that the "attribute-string" symbol and the "id" string got passed in as part of the pattern, rather than being evaluated and replaced with the value of the "ID" attribute. The backquote, above, introduces a "quasi-quote" expression, which is similar to a regular quoted expression, except that you can "unquote" certain parts of it, so that they will be evaluated. In this case, we're unquoting the (attribute-string) call, such that the final result of this would be a structure like: (scrap (continues "ABC")) if the current node was an element with an ID of ABC, that is. :) -Brandon :) DSSSList info and archive: http://www.mulberrytech.com/dsssl/dssslist
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