In XML empty is still a content. An empty text node contains zero
characters. Different from nothing or null.
For example, if I have the expression concat($X,$Y) it is valid for Y to
be empty, and its reasonable for someone to set it to empty and be used.
$Y needs to have a value in this case and the expression need to evaluate.
Un-initialize will require its own construct, a) to not confuse between
empty and null, and b) since we currently do not allow null to be selected.
Assaf
Tony Fletcher wrote:
> This issue has been added to the wsbpel issue list with a status of
> "received". The status will be changed to "open" if the TC accepts it
> as identifying a bug in the spec or decides it should be accepted
> specially. Otherwise it will be closed without further consideration
> (but will be marked as "Revisitable")
>
> The issues list is posted as a Technical Committee document to the
> OASIS WSBPEL TC pages
> <http://www.oasis-open.org/apps/org/workgroup/wsbpel> on a regular
> basis. The current edition, as a TC document, is the most recent
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> the next posting as a TC document will include this issue. The list
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> announced, is available at this constant URL
> <http://www.choreology.com/external/WS_BPEL_issues_list.html>.
>
>
> ------------------------------------------------------------------------
>
>
> Issue 197: Un-initializing BPEL variables
>
> *Status:* received
> *Date added:* 12 Mar 2005
> *Categories:* Data Handling
> <http://www.choreology.com/external/WS_BPEL_issues_list.html#category_data_handling>
> *Date submitted:* 11 March 2004
> *Submitter:* Yaron Y. Goland <mailto:>
> *Description:* Is it legal/possible to un-initialize a variable in
> BPEL? What happens, for example, if one tries to assign a static from
> value that is empty? Should we allow for from-spec to be empty and
> have that mean that the target is uninitialized?
> *Submitter’s proposal:* Being able to un-initialize variables is a
> generically useful thing. It makes it clear when a variable doesn't
> contain a 'useful' value. So I think we should provide a way to
> un-initialize variables.
> *Changes:* 12 Mar 2005 - new issue
>
> ------------------------------------------------------------------------
> Best Regards,
>
> Tony/ /
>
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