[Openberg-devel] Current status

[David T. <dt...@en...>]

   Hi,
 Here is my current status update.

Annotations (Mozilla implementation) :

* The Annotation classes should handle dynamic modification of an Xhtml page 
through instances of LowLevelAnnotation. Each application of 
LowLevelAnnotation may be undone without having to undo any other 
LowLevelAnnotation. The modifications are not saved in the Xhtml page but as 
a list of LowLevelAnnotation applications, in another file.


* The algorithm for adding or removing an annotation with Gecko is written, 
theoretically implemented but not compiled yet -- hence not tested.

* This algorithm depends on the document abstraction which should have been 
easy to write, if I had understood some Gecko headers correctly.


Document abstraction (Mozilla implementation) :

* The document abstraction should handle document loading either from a 
stream or from a Apache Xerces DOMDocument, adding Xml Ids at key points in 
the document for easier Xml navigation, sharing one document between Gecko 
widgets, cacheing already-loaded documents with their annotations, ...


* I was mislead by some ambiguous headers in Gecko to believe that the 
sharing & cacheing of documents was easy. Actually, it seems almost 
impossible to do.


* I am now working on emulating this behaviour : each widget shall load the 
document from its original stream. Annotations to one page shall be forwarded 
to the other instances of the same page using an event mechanism. Streams 
will be cached rather than documents and LowLevelAnnotations will be 
reapplied whenever one page is loaded.



Bottom line : Annotations are now on hold. I am now starting serious work on 
the document abstraction.

Be reading you,
 Yoric

-- 
===
 David Teller
  LIP, ENS Lyon : Dav...@en...
   Bureau 306, Poste 87-96 -- http://www.ens-lyon.fr/~dtelle
    Editions Vigdor -- http://www.vigdor.com
     Projet OpenBERG -- http://openberg.sourceforge.net
     
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