RE: [xml] Substitution of nested entity references

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

Hello Daniel,

> -----Original Message-----
> From: Daniel Veillard [mailto:veillard redhat com]
> Sent: Wednesday, April 10, 2002 8:30 PM
> To: Henke, Markus
> Cc: 'xml gnome org'
> Subject: Re: [xml] Substitution of nested entity references
>
> <snip />
>
> [...] yes, simply fix xmlNodeGetContent() and
> xmlNodeListGetString(,,1) to behave correctly in this case.
> I actually think it is a libxml2 bug and I would appreciate if you
> could take care of it since you have explored much of it.
> Simply recurse on entity refs content to complete the work currently
> handled only at level 1 of entity indirection. As explained before
> this shall not loop since it would result in a well formedness
> error to have a loop in entities references.
>
>   thanks !
>
> Daniel

the patch is basically finished, but i've a serious problem to
test it:
To do a complete recurse on entity refs content, i need the
child node list of the corresponding entity declaration.
But it seems that the "ent->childs" list of an entity declaration
remains NULL after parsing if this entity occurs only in an
attribut value.
Sounds a bit strange, an example may help:

==================================================================
<?xml version="1.0" encoding="iso-8859-1" standalone="yes" ?>

<!DOCTYPE aElement [
  <!ELEMENT aElement ANY>
  <!ATTLIST aElement aAttr CDATA #REQUIRED>
  <!ENTITY aNestedEnt "i_am_a_nested_entity">
  <!ENTITY aEnt "A_&aNestedEnt;_A">
  <!ENTITY bEnt "B_&aEnt;_B">
]>

<aElement aAttr="Text &aEnt; MoreText">Content &bEnt; MoreContent
</aElement>
====================================================================

=============================================
/* [...] */
xmlSubstituteEntitiesDefault(0);
docPtr = xmlParseFile("./nestedEntity.xml");
ent = xmlGetDocEntity(docPtr, "aEnt");
/* we'll get ent->childs == NULL when 'aEnt'
   only occurs in attribut value */
ent = xmlGetDocEntity(docPtr, "bEnt");
/* we'll get ent->childs != NULL when 'bEnt'
   occurs as element content */
=============================================

As soon as 'aEnt' can also be found as part of element content,
the "childs" list of the entity declaration is non NULL.

I don't know if this behaviour is intended, i guess it's
rather not. I've tried to debug my test program to find out what
happens, but i was quite lost in the depths of the libxml
DOM-building process.
If this behaviour is a bug and you can point me in the
right direction, i'll try to fix it. If not... well,
we'll see  :)

Ciao, Markus