RE: [xml] (correct) way to link external subset to newly crea ted XML doc

["Henke, Markus" <Markus_Henke ordat com>]

> -----Original Message-----
> From: Daniel Veillard [mailto:veillard redhat com]
> Sent: Tuesday, January 08, 2002 3:10 PM
> To: Henke, Markus
> Cc: 'xml gnome org'
> Subject: Re: [xml] (correct) way to link external subset to newly crea
> ted XML doc
>
>
> On Tue, Jan 08, 2002 at 02:59:27PM +0100, Henke, Markus wrote:
> > >   So yes this creates a reference to the external subset. But that
> > > reference is contained in the document and hence kept as 
> part of the
> > > internal subset informations.
> >
> > OK, that'll work for me ATM.
> > But what's to do when i actually use an internal (build 
> from scratch)
> > *and* an (existing) external subset?
> > When i create the *reference* to the external subset
> > via xmlCreateIntSubset(), xmlDocPtr->intSubset points to 
> the *external*
> > subset!?
>
>  it does it by name. Not by a pointer to the xmlDtdPtr.
>
> > Who's than pointing to the internal subset, and where
> > xmlDocPtr->extSubset is pointing to?
>
>  this one points to the xmlDtdPtr of the external subset.
>
> In a nutshell if you have internal and external subsets:
>    - The DOCTYPE declaration generates an xmlDtdPtr node which is
>      one of the children of the xmlDocPtr (before the root element)
>    - This xmlDtdPtr is also referenced from the xmlDocPtr as 
>      xmlDocPtr->intSubset
>    - the external subset System ID and Public ID are stored in this
>      xmlDocPtr->intSubset because they are actually carried 
> by the DOCTYPE
>      as xmlDocPtr->intSubset->ExternalID and 
> xmlDocPtr->intSubset->SystemID
>    - the external subset (if parsed which is not the default 
> behaviour)
>      is stored as xmlDocPtr->extSubset
>
> If you have no external subset but an internal subset:
>    - xmlDocPtr->extSubset is NULL
>    - xmlDocPtr->intSubset->ExternalID and 
> xmlDocPtr->intSubset->SystemID are
>      NULL
>
> If you have no internal subset but an external subset:
>    - it's like the case where both are present except 
> xmlDocPtr->intSubset
>      have no children
>
> If you have no internal subset nor external subset:
>    - both xmlDocPtr->intSubset and xmlDocPtr->extSubset are NULL
>    - there should be no xmlDtdPtr in the full document tree.
>
>  I hope this clear things up,

Yep, i've got it now. Many thanx!
The crux of the matter is that the DOCTYPE declaration holds the
reference to the external subset (with systemURL and publicID)
*and* is the root node of the internal subset. That's very clear,
but i've to bring it to mind...
I guess your summary to that subject could be usefull also
for other libxml user...?

> Daniel

Thanx & Ciao, Markus



Mit freundlichen Gruessen - Kind regards
Markus Henke



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