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From "Ate Douma (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SCXML-242) Provide JSON based datamodel as replacement for XML
Date Sat, 26 Dec 2015 15:47:49 GMT
Ate Douma created SCXML-242:
-------------------------------

             Summary: Provide JSON based datamodel as replacement for XML
                 Key: SCXML-242
                 URL: https://issues.apache.org/jira/browse/SCXML-242
             Project: Commons SCXML
          Issue Type: New Feature
            Reporter: Ate Douma
            Assignee: Ate Douma
             Fix For: 2.0


The XML/XPath datamodel, with 'convenient' support through Data() and Location() operations
for usage within the Jexl, Javascript and Groovy SCXML languages has been the root and cause
of many invasive and complicating problems in the implementation of Commons SCXML (2.0).
The [SCXML 1.0 specification|http://www.w3.org/TR/2015/REC-scxml-20150901/] has dropped the
xpath datamodel from the specification because of similar/same complications and (also thereof)
lack of 'reference' implementations.

Further maintaining and trying to 'improve' on the XML/XPath datamodel support in Commons
SCXML therefore will be stopped and removed from the implementation all together.
Instead and as replacement new JSON datamodel support will be added, which also aligns with
the (optional) Ecmascript datamodel as described in the SCXML specification.

The JSON based datamodel will be parsed (in Java) into a 'raw' object model, consisting of
plain Maps (JSON Object) and Lists (JSON Array), and thus trivially to be used from the Commons
SCXML supported languages (Jexl, Groovy and Javascript).

As this new JSON datamodel will replace all XML/XPath usages, part of this new feature implementation
will be updating and replacing all the example/unit-test usages in the codebase, and thereby
also removing all usages of the custom Data() and Location() functions.

Once these changes are in place, the Data() and Location() custom functions will then be removed
as well.

Finally, the XPath language itself then can be removed, including all the supporting logic
scattered throughout the engine implementation itself, but this will be done as a separate
issue afterwards.     




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