Re: [xml] Interactive node insertion

Date view Thread view Subject view Author view

From: Mathias Hasselmann (Mathias.Hasselmann@gmx.de)
Date: Sun Oct 03 1999 - 17:36:58 EDT

Daniel Veillard wrote:
>
> > After parsing and validating a xml file I would like to insert new
> > elements interactivly without breaking the validated tree.
> >
> > Since users don't have to know the DTD I need a way to find out, which
> > insertions are allowed for a selected elements.
> >
> > Is there a common way to do this?
>
> Hum, no, and that's a good point.
> I added validation to the parsing step, but it's not really glued in
> the tree manipulation functions yet.
>
> Would something like:
>
> int xmlIsValidChild(const xmlChar *parent, const xmlChar *child);
>
> suit your needs, or does something more prospective like returning
> the list of valid child be more useful. In the later, I'm afraid it
> won't be really more easy to use/remap the existing list based functions
> and switch to arrays. All advanced structured editors I have seen in
> the past were "guiding" the user with a list of possible childs. So
> the second kind of function would still be useful.

The second function is similar to that what I want. But since we have
xmlGetDtdElementDesc the list easily could be build by walking through
xmlElement::children and calling xmlIsValidChild for each (unique)
name. (We simply would need xmlIsValidChild.)

BUT at least I would need something more specific functions:

  * int xmlIsPrependable (xmlNode element, const xmlChar *new_element);
  * int xmlIsValidReplacement (xmlNode element,
                               const xmlChar *new_element);
  * int xmlIsAppendable (xmlNode element, const xmlChar *new_element);

(xmlIsValidChild implemented by using such functions,
 xmlGetValidChilds too...)

Probably you find a function declaration more generical than this,
but since DTD are quite powerfull I think we have to separate the
cases mentioned...

If you could give me a clue how to implement the functions...

Ciao,
Mathias 

-- 
WWW: http://www.arco.de/~mhasselm/ http://www.dominanz-haus.de/
PGP-Fingerprint: 4D15 89ED 7299 6428 FEE6  C66F 5D40 6504 55E5 72F3
----
Message from the list xml@rufus.w3.org
Archived at : http://rufus.w3.org/veillard/XML/messages
to unsubscribe: echo "unsubscribe xml" | mail  majordomo@rufus.w3.org

Date view Thread view Subject view Author view

This archive was generated by hypermail 2b29 : Wed Aug 02 2000 - 12:29:47 EDT