Re: [Tclxml-users] Re: API Change?

[Steve B. <Ste...@ex...>]

Dear Simon,

This problem was reported as a bug on SF and has been fixed.  The fix 
has not yet been committed to the CVS repository, but will be soon 
along with other changes for the v3.1 release (coming RSN).

The problem was in the libxml2 wrapper code.  This code now generates a 
call to the endelement callback for empty elements.  However, due to 
the current TclXML C API it cannot signal the empty element (ie. -empty 
true) in the args.

For the purpose of making the v3.1 release I won't change the C API, 
but will get that into a future v3.2 release.

HTHs,
Steve Ball

On 14/05/2005, at 8:22 PM, Simon Wright wrote:

> I'm a newcomer to the list, using TclTkAquaBI-8.4.9.0 (MacOS X), and I 
> seem to have the same problem.
>
> I'm not sure what David's script was intended to show since it doesn't 
> have the problematic structure!
>
> This script
> ---------------------------------
> package require xml
>
>  proc elemStartCmd {elem_type attr_list args} {
>      puts [list >>>>>>>>>> open $elem_type ($attr_list $args)]
>  }
>
>  proc elemEndCmd {elem_type args} {
>      puts [list >>>>>>>>>> close $elem_type ($args)]
>  }
>
>  proc descriptiveData {cdata} {
>      puts [list cdata: $cdata]
>  }
>
>  set theParser [::xml::parser                               \
>                     -elementendcommand      elemEndCmd      \
>                     -elementstartcommand    elemStartCmd    \
>                     -characterdatacommand   descriptiveData \
> 		    -reportempty            1 ]
>
>  set    xmldata ""
>  append xmldata "<toplevel> Document root\n"
>  append xmldata "   <abstract></abstract>/n"
>  append xmldata "   <abstract/>/n"
>  append xmldata "</toplevel>\n"
>
>  $theParser parse $xmldata
> ---------------------------------
> outputs this
> ---------------------------------
> grendel:~/cf simon$ tclsh endcommand.tcl
> >>>>>>>>>> open toplevel ( {-namespace {})}
> cdata: { Document root
>    }
> >>>>>>>>>> open abstract ( {-namespace {})}
> >>>>>>>>>> close abstract ()
> cdata: {/n   }
> >>>>>>>>>> open abstract ( {-namespace {})}
> cdata: /n
> >>>>>>>>>> close toplevel ()
> ---------------------------------
> so there are three things:
> (a) the elementstartcommand doesn't see {-empty true} in args
> (b) the elementendcommand doesn't see {-empty true} in args
> (c) the elementendcommand doesn't get called at all for the empty 
> element.
>
> I didn't spot -reportempty at first, but it made no difference.
>
> Original message:
>
>  Steve Ball <Steve.Ball@zv...> writes:
>
>  > First I"ve heard of this... TclXML v3.0 is a major version change,
>  > but the API has not changed *that* much.
>
>  > TclXML v3.X passes all of its regression tests. including the
>  > parsing API and parsing empty element syntax.  I will investigate
>  > further, back a small sample XML source document and Tcl script
>  > would be helpful.
>
>  Here"s a script that Massimo, the guy who noticed this, sent me.
>
>  --
>  David N. Welton
>  Personal:                   http://www.dedasys.com/davidw/
>  Apache Tcl:                 http://tcl.apache.org/
>  Free Software:              http://www.dedasys.com/freesoftware/
>  Linux Incompatibility List: http://www.leenooks.com/
>
>  ----
>  package require xml
>
>  proc elemStartCmd {elem_type attr_list args} {
>      puts [list >>>>>>>>>> open $elem_type ($attr_list $args)]
>  }
>
>  proc elemEndCmd {elem_type args} {
>      puts [list >>>>>>>>>> close $elem_type ($args)]
>  }
>
>  proc descriptiveData {cdata} {
>      puts [list cdata: $cdata]
>  }
>
>  set theParser [::xml::parser                               \
>                     -elementendcommand      elemEndCmd      \
>                     -elementstartcommand    elemStartCmd    \
>                     -characterdatacommand   descriptiveData ]
>
>  set    xmldata ""
>  append xmldata "<toplevel> Document root\n"
>  append  xmldata "   <livello1> Tag for generic element </livello1>\n"
>  append xmldata "   <livello1 attr1_1=\"v1\" attr1_2=\"v2\"> Nuovo 
> Elemento contenente altri
> Elementi\n"
>  append xmldata "        <livello2 attr2_1=\"v1\" attr2_2=\"v2\"/>\n"
>  append xmldata "        <livello2 attr2_1=\"v3\" attr2_2=\"v4\"/>\n"
>  append  xmldata        "        <livello2> Tag chiuso in modo 
> \"canonico\" </livello2>\n"
>  append xmldata "   </livello1>\n"
>  append xmldata "</toplevel>\n"
>
>  $theParser parse $xmldata
>
>
>
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