Re: [xml] DTD Mania

[Daniel Veillard <veillard redhat com>]

On Thu, May 10, 2001 at 02:57:58PM -0400, David Allen wrote:
> Apologies if this is a repeat.  I've been having problems with my mail
> server, I sent this before, and never got it back.  

  well it did.

> On Wed, May 09, 2001 at 06:06:40PM -0400, Daniel Veillard wrote:
> > On Wed, May 09, 2001 at 05:40:29PM -0400, David Allen wrote:
> > > - Say I'm dealing with "baz.xml" and "foobar.dtd".  I encounter the
> > >   "blargens" tag, how can I look into the DTD structure to get a list
> > >   of tags which are valid children of "blargens"?  I'm not looking at
> > >   rewriting the validation, but getting a list of what's valid in
> > >   certain contexts for creating XML documents from nothing according
> > >   to the rules of validity.
> >
> >    This is defined in the valid.c module:
> >      http://xmlsoft.org/html/libxml-valid.html#XMLVALIDGETVALIDELEMENTS
> >      xmlValidGetValidElements ()
>
> This doesn't seem like it's going to work.  The documentation says to
> use xmlValidGetValidElements(NULL, node->childs, ...) in order to
> prepend an element underneath 'node', and to use
> xmlValidGetValidElements(node->last, NULL, ...) to append an element
> underneath 'node'.
>
> The problem is that if node has no children, then both node->childs
> and node->last will be NULL, right?  If the first two args to the
> function are NULL, then it always returns -1 (error).
>
> Am I missing something or does this function work only in the case
> where you already have child elements?

  yep seems this function don't allow this ... But the next function
Just below the one I pointed to seems to do exactly this !

  xmlValidGetPotentialChildren ()
  http://xmlsoft.org/html/libxml-valid.html#XMLVALIDGETPOTENTIALCHILDREN
  Build/extend a list of potential children allowed by the content tree

    you really don't want to read the doc ?

Daniel

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