I'm going to leave it up to my users to make sure they structure their XPath expressions correctly for the documents they expect ;-). So I don't have to worry about the actual prefixes and URLs (I don't think). What I need to know is if those 2 lines below will handle all the cases.
What would the Jaxen code look like? -----Original Message----- From: bob mcwhirter [mailto:[EMAIL PROTECTED]] Sent: Monday, January 14, 2002 4:20 PM To: David Hooker Cc: [EMAIL PROTECTED] Subject: Re: [dom4j-user] XPath and namespaces > I'm still a little unclear on how XPath and namespaces relate. > > I'm working on a program which can take as input 2 things: any arbitrary > xxml document, and any arbitrary xpath expression. I need to run the > expression on the document. My initial guess is that this code will do the > trick: > > XPath xpath = > (XPath)DocumentHelper.createXPath(expression); > Node selectedNode = > (Node)xpath.selectSingleNode(document); > > I *think* this should work for every case (assuming the xpath is correctly > entered by the user), but this code doesn't take namespaces into account. I > remember having to jump through some hoops for another part of my code which > does use namespaces, and I also seem to remember some function which adds > all the namespaces of a document to the xpath object. Am I mistaken here? > What is the correct way to go? What you'll want to do: a) Determine the namespace(s) of the element(s) that your XPath refers to. b) Bind directly into the XPath, irrespective of any target document, the prefix->URI that *you* select for the context of your XPath. c) Now, regardless of the prefix used in a target document, if the URI resolves to the same URI that *your* prefixes (from (b) above), then a match will occur. You may bind: cheese -> http://pizza.org/pizza-ml While the document bings crust -> http://pizza.org/pizza-ml If you XPath is "cheese:call-in-order", it'll match a document containing: <call-in-order xmlns:crust="http://pizza.org/pizza-ml"/> As far as actual API you need... beats me. I typically use Jaxen directly, and not through the dom4j api, for some reason. -bob _______________________________________________ dom4j-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/dom4j-user
