Re: [xml] (no subject)

[Morus Walter <morus walter tanto-xipolis de>]

Daniel Veillard writes:
> On Sun, Sep 28, 2003 at 10:35:57AM -0400, Jim Crafton wrote:
> > I am using libxml for a docbook editor. I would like to provide  
> > autocompletion for docbook, such that when you type a "<" character the 
> >  
> > editor is able to supply a valid set of tags, and even better, would be 
> >  
> > the ability to have the tags correspond with the parent, so you only 
> > see  
> > the appropriate tags for where you are at in the document. So I *think* 
> >  
> > (I am a bit new to this so bear with me) I can use libxml to read the  
> > docbook DTD to pull down all the valid tags for docbook. Is this right, 
> >  
> > and if so, how do I do this?  I didn't see an obvious samples of this  
> > (or maybe I missed something. 
>
>   yes
>   xmlValidGetValidElements
hmm. This function isn't really suitable for an editor.
It only list's elements, that leave the document valid.
So for a content model like
<!ELEMENT a (b,c)>
and a newly inserted a element, it won't list any apropriate elements,
since <a><b>...</b></a> isn't valid.
Editing requires invalid documents as intermediate states here.

So IMHO there is no simple function in libxml available, that can tell
an editor which elements it should offer for insert at a given position.

xmlValidGetPotentialChildren gives a list of all elements in the content
model of an element, so an editor using this function would suggest
b and c even if b is already inserted.

        Morus