In early committee drafts of BPEL 2, the variable variant of from-spec and to-spec did not
allow access to the variables or the BPEL functions. This is the currently implemented
behavior.
The BPEL 2 standard (i.e. final version) does allow access to the variables and the
functions. Since BPEL 1.1 does not specify the XPath evaluation context, either behavior
is valid.
If you'd like, file a Jira issue for changing the behavior of the variable variant of
from-spec and to-spec to adhere to the BPEL 2 standard. This is relatively easy to do and
will possibly be included in jBPM BPEL 1.1.GA.
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