Steve Ball wrote:
> 
>  I've been working on TclXML v3.0 and trying to incorporate
>  some new ideas on document and node management.  In particular,
>  your request to have implicit document destruction has
>  been implemented.  However, I'm now at the point where
>  I just cannot get it to work reliably.

[... explanation deleted ...]

>  My conclusion is that object shimmering defeats any attempt
>  to have mutable objects automatically garbage collected.

That's a correct conclusion.  This sort of thing just
isn't possible in Tcl.  Of course some extensions do
it anyway, but there is no way to make it 100% reliable.

>  At this point there is a choice: don't define document node commands
>  (ie. stay with the v2.x TclDOM API) or require explicit
>  destruction of documents.  At this stage my preference is for
>  the latter.

Even if you don't define document node commands, there are
still other opportunities for shimmering.  ([eval] is probably
the main one; there are many others.)

It's possible, with great care, to write code that avoids
shimmering altogether, but IMO that places too large a burden
on application programmers.  I'm strongly in agreement with
Steve's preference for explicit destruction.


--Joe English

  jenglish@[...].com


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