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Re: [xml-dev] Unexpected Ambiguous Model in XSD Schema

I think you're right (although Xerces didn't complain about my formulation). (img+, figcaption?) is the better way to express the intent.

(Clearly it's been too long since I had to do serious DTD model development.)


Eliot Kimber

On 12/22/17, 11:18 AM, "Christopher R. Maden" <crism@maden.org> wrote:

    On 12/22/2017 12:12 PM, Eliot Kimber wrote:
    > If I was coding this as a DTD it would be:
    > <!ELEMENT figure
    >     ((figcaption, (img)+) |
    >      ((img)+, figcaption) |
    >      ((img)+))
    > Which is definitely not ambiguous.
    I disagree.  An initial img can match either the second or third img 
    token in the content model, thus ambiguous (in the slightly weird SGML 
    sense of the term).
    In a DTD, I’d use
    <!ELEMENT figure
         ((figcaption, img+) |
          (img+, figcaption?)) >
    Chris Maden, text nerd
    <URL: http://crism.maden.org/ >
    Emperor Norton had the right idea.
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