Ate Douma created SCXML-242:
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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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