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Is there any work being done on XML parsers(preferably in Java) that will allow incremental parsing with validation? I'd like to have the ability to add elements to a loaded document tree knowing immediately whether that addition is valid. It appears that the Microsoft parser might be able to accomplish this, but not via the public API. I'd implement this myself, but i'm a little hesitant about the vagaries of on the fly DTD validation. Are there any resources out there that discuss this sort of thing? I would call this a "validating XML Object Model", not an incremental parser, but anyway, it would be relatively simple to modify the MSXML Object Model to do this since the Document class holds onto the DTD object and therefore all the state information you need for validation. First you would have to find the Element Declaration for the parent you are adding children to, using Document.getDTD().findElementDecl(e.getParent().getTagName()), then you need to create a Context object so you can call checkContent to validate the addition. The Context is initialized using initContent() then you would have to walk through all the children (including the new child) calling checkContent to make sure the entire content of the parent is still valid. It has to be done this way because checkContent is optimized for validating while you parse. Similar things would be done for removeChild. The attribute validation is a little harder to split out since currently this is done in AttDef.parseAttValue. You'd have to split this into parseAttValue and validateAttValue so you can call the validation without having to parse anything. Once you've done that validation for attributes is easier because it doesn't require any context. Good luck, let us know how it goes ! 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/ 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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