support read-only system variables
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Key: SCXML-99
URL: https://issues.apache.org/jira/browse/SCXML-99
Project: Commons SCXML
Issue Type: Bug
Affects Versions: 0.9
Reporter: Ingmar Kliche
The SCXML WD [1] describes a set of system variables which are read-only for
the application. See section 5.5 [2]: "The Data Module maintains a protected
portion of the data model containing information that may be useful to
applications...."
It may necessary to abstract out the notion of a partitioned root context, just
like we have a notion of ordinary context.
The implementation should take into account, that some expression languages
support read-only behaviors natively (such as ECMAScript through scope chains),
whereas other expression languages (or there implementations resp.) don't.
[1] http://www.w3.org/TR/2008/WD-scxml-20080516/
[2] http://www.w3.org/TR/2008/WD-scxml-20080516/#SystemVariables
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