Re: [xml] find out wether a node is a leaf or contains other elements

[Daniel Veillard <veillard redhat com>]

On Tue, Jun 07, 2005 at 11:40:15AM +0200, "klemens letulé" wrote:
> > > I just started to use libxml and am already stuck. The question is more
> > or
> > > less in the subject. I want to restrict the deletion of nodes who have
> > no 
> > > child elements.
> >
> >   Have you read the docs ? 
> >     http://xmlsoft.org/tree.html
> > No child element may mean various things, your question is ambiguous.
> > Node->children == NULL might be the test you want ... or not.
> >
> > Daniel
>
> Yes, i read the docs... maybe it was too much input in a short time! 

  Take your time and don't rush. It's like asking questions on a nuclear
physic mailing list without having taken the time to read and digest
the basic science around it.

> I try to make it more clear what i want. As an element i mean now an
> element as in the DTD.
>
> <!ELEMENT fw-input-rule (action, protocol, from-ip, from-port, to-ip,
> to-port, log)>
> <!ELEMENT action (#PCDATA)>
> <!ELEMENT protocol (#PCDATA)>
> <!ELEMENT from-ip (#PCDATA)>
> .
> .
> .
>
> So it should be possible to delete a "fw-input-rule node" but not an 
> "action node".
>
> Is there an easy way to distinguish between elements who have other "child 
> elements" and elements who are just a leaf?

  Your questions are confusing, you mix content model and actual tree.
I can't answer your question it's too undefined. Where are those DTD
declarations ? External DTD subset are not loaded by default. The 
content field of the nodes may be usable or not. And your question is
not precise enough to answer
   <fw-input-rule><from-ip/><from-port/><to-ip/></fw-input-rule>
   <fw-input-rule/>
have different model, I can't tell what you're considering.

  Did you try xmllint --debug on some of those tree to get an idea of
what the structure looks like ? You must experiment because there is 
no way I can dump the needed informations in your brain instantly. There is
a learning curve, then you will be able to ask clearer questions.

Daniel

-- 
Daniel Veillard      | Red Hat Desktop team http://redhat.com/
veillard redhat com  | libxml GNOME XML XSLT toolkit  http://xmlsoft.org/
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