RE: Xalan C++ changes coming

[Scott Boag/CAM/Lotus <Sc...@lotus.com>]

No, not at all.  XalanC will be able to aggregate to the Xerces set of DOM
classes.  In the long run, we may get to a common set of abstract DOM
classes that both Xerces and Xalan can use without aggregation.

-scott




                                                                                                                   
                    "Sean Forde"                                                                                   
                    <sforde@lizar        To:     <xa...@xml.apache.org>                                        
                    dtech.com>           cc:     (bcc: Scott Boag/CAM/Lotus)                                       
                                         Subject:     RE: Xalan C++ changes coming                                 
                    03/31/2000                                                                                     
                    04:13 PM                                                                                       
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                    xalan-dev                                                                                      
                                                                                                                   
                                                                                                                   



I was assuming that Xalan would use the Xerces set of DOM classes, no? Does
this mean that XML which I have parsed into a Xerces DOM tree has to be
serialized and then reparsed by Xalan?

           -Sean Forde

>   -----Original Message-----
>   From: David_N_Bertoni@lotus.com [mailto:David_N_Bertoni@lotus.com]
>   Sent: Friday, March 31, 2000 12:03 PM
>   To: xalan-dev@xml.apache.org
>   Subject: Xalan C++ changes coming
>
>
>   I want to let everyone know that we are preparing to check in some
major
>   changes to the Xalan C++ code base.  These changes should
>   appear early next
>   week.
>
>   We are planning for Xalan C++ to move to an abstract DOM and
>   since there is
>   no standard set of C++ abstract base classes, we are defining our own.
>   These will mirror the W3C's IDL definitions, but will be
>   qualified with the
>   Xalan name, to avoid collisions.  (If, and when, the C++
>   community agrees
>   on a set of base classes, we will migrate to those.).
>
>   Reasons for doing this include:
>
>      1. By using a set of abstract base classes, other DOMs can
>   be used with
>      Xalan.  For example, someone might write a "virtual" DOM that is not
>      parsed from XML into a tree structure, but behaves like it was.
>
>      2. We hope to create a high-performance, read-only input DOM
>   for Xalan
>      C++, similar to Xalan J's DTM.  We will tailor this DOM for
>   XSLT, which
>      should give us a serious performance boost.
>
>      3. Our internal stylesheet classes will also derive from this DOM,
>      making it easier for people to write stylesheet tooling interfaces.
>      Currently, we derive these classes from  Xerces' internal
>   implementation
>      classes.
>
>      4. There has been a lot of interest in COM interfaces for Xerces and
>      Xalan.  Using a set of abstract classes will make it much easier to
>      write COM interfaces for Xalan C++.
>
>   However, I do need to make it clear that these interfaces are
>   experimental,
>   and are subject to change.  We hope that, at some point, we can
>   migrate to
>   a standard set of C++ abstract base classes for the DOM.
>
>   I also want to give another pitch to recruit contributions to Xalan
C++.
>   We have a lot of interesting things that need to be done, and
>   it would be
>   great to bring in more people.
>
>   Dave
>