[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: XSchema question
> 'Inline-schema' looks similar to internal DTD subset except it can be any > where in the XML stream and not just in the !DOCTYPE declaration section at > the beginning of a XML stream. 'Dynamic-schema' is simply schema which can > be changed. I don't know XSchema too well so allow me to use DTD syntax to > illustrate an exampe: > > <schema> > <!ELEMENT foo (a, b)> > </schema> > <foo> > <a> > <b> > </foo> > <schema> > <!ELEMENT foo (a, c)> <!-- redefine foo element's containment > rules --> > </schema> > <foo> > <a><c> > </foo> Hey! Nice idea! XSchema certainly supports this -- it's just a bunch of XML elements. All your processor needs to do is recognize the XSchema elements, store the information in them, and apply it to all following elements until the next XSchema element is reached. (Remember that the root element of an XSchema document is named "XSchema" -- this makes recognition and containment of XSchema elements easy.) Some comments: 1) You've probably already realized this, but a DTD for such a file would be of little or no use. Because each XSchema section can introduce new elements and redefine old ones, the DTD would probably consist of a bunch of elements with content models of ANY. This is of no use either for validation or determining storage structures on the fly. 2) The above document is not well-formed. You need to wrap it in a container element such as <log-stream>. 3) The semantics of how each successive XSchema affects the previous XSchema are not well-defined (additive? total replacement? partial replacement?) and probably won't be defined in XSchema 1.0. You are therefore on your own. For safety's sake, I suggest you treat each XSchema as a completely new definition of the following elements. -- Ron Bourret 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...)
|
PURCHASE STYLUS STUDIO ONLINE TODAY!Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced! Download The World's Best XML IDE!Accelerate XML development with our award-winning XML IDE - Download a free trial today! Subscribe in XML format
|