[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: The Peace Process: DOM and namespaces...
James Clark wrote: > Rick Ross wrote: > > > the XSL working draft > > specification requires namespace support that apparently cannot be > > implemented effectively if the primary input source is a dynamically built > > DOM tree. > > I can't see this. > > Why can't you put a layer on top of the DOM that provides namespace > processing? For example, you could have an NSNode object that points to > the DOM Node and a set of prefix bindings (and probably a parent > NSNode). The NSNode objects will be temporary. You wouldn't have to > reparse the document, and you don't have to keep two trees in memory. > You can also provide other things in this layer that help XSL > performance such as document order comparison. This is a familiar design model when you want to add functionality to a business object without formally extending it. I have looked into this myself, but it still poses problems, namely you need to either build this entire map from iterating over the entire DOM tree and writing code like this for every node in the document: In other words, been there done that. NamedNodeMap attributes = node.getAttributes(); if (attributes != null) { int length = attributes.getLength(); Node attribute; String nodeName; for (int i = 0; i < length; i++) { attribute = attributes.item(i); nodeName = attribute.getNodeName(); if (attribute.getNodeName().equals("xmlns")) { // Do namespace default processing } else if (attribute.getNodeName().startsWith("xmlns:") { // Do namespace processing } } } In terms of O notation (I hate to be academic here) that is N^2 plus the underlying cost of string comparisons. I cannot believe people see the obvious flaws with this approach. It is significant. And you still need to reparse the entire document each time to safely create these bindings as the source tree can mutate at any time. Tyler xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1 To (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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