Re: [xml] DTD Handlers

[Daniel Veillard <veillard redhat com>]

On Fri, Jul 28, 2006 at 11:35:45AM +0100, srivatsan s wrote:
> I am trying to use libxml DTD handlers.
>   I have the following below example 
>    
>    
>   <!ELEMENT p (#PCDATA | %font; | %phrase; | %special; | %form;)* >
>   This call back xmlSAX2ElementDecl , takes xmlElementContentPtr
>   Whose data Structure is 
>   struct _xmlElementContent {
>       xmlElementContentType     type; /* PCDATA, ELEMENT, SEQ or OR */
>       xmlElementContentOccur    ocur; /* ONCE, OPT, MULT or PLUS */
>       const xmlChar             *name;    /* Element name */
>       struct _xmlElementContent *c1;  /* first child */
>       struct _xmlElementContent *c2;  /* second child */
>       struct _xmlElementContent *parent;  /* parent */
>       const xmlChar             *prefix;  /* Namespace prefix */
>   };
>    
>   What are these first child and second child ptrs . 
>   Can anyone explain with the above example .

 impossible because your example uses parameter entity references which 
are not described in your post. Anyway it's a matter of reading and 
understanding the spec as the internal model is a direct mapping:

  http://www.w3.org/TR/REC-xml/#sec-element-content

 it reflects the choice and seq constructions it's a binary tree obviously
once entities are expanded.
 You won't be able to make sense of the libxml2 internals until you understand
the spec, sorry ...

Daniel


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