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From: "Woonsan Ko (JIRA)" <jira@apache.org>
To: issues@commons.apache.org
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Subject: [jira] [Updated] (SCXML-101) <datamodel> not handled as global
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     [ https://issues.apache.org/jira/browse/SCXML-101?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Woonsan Ko updated SCXML-101:
-----------------------------

    Fix Version/s:     (was: 0.10)
                   2.0

> <datamodel> not handled as global
> ---------------------------------
>
>                 Key: SCXML-101
>                 URL: https://issues.apache.org/jira/browse/SCXML-101
>             Project: Commons SCXML
>          Issue Type: Bug
>    Affects Versions: 0.9
>            Reporter: Ingmar Kliche
>             Fix For: 2.0
>
>
> The SCXML spec says: "Logically, there is a single globally visible data model for the entire state machine. As an authoring convenience, however, we allow <datamodel> as a child of any <state>, thus allowing parts of the data model to be distributed throughout the document closer to the locations where the data will be accessed. However, all instances of the <data> element are created and initialized when the state machine is instantiated and may be accessed from any state at any time." [1]
> There are two issues:
> 1) The current impl of commons-scxml introduced a scoping, such that <data> in <datamodel> elements contained within a <state> are only visible in this state and its children (due to context chain). I.e. the <datamodel> is not entirely global.
> 2) Initialization of <datamodel>'s contained in a <state> (i.e. non-root-datamodels) take place while entering the corresponding state for the first time while creating the context (SCXMLInstance#getContext()). But initialization of <data> elements has to take place at state machine initialization time.
> [1] http://www.w3.org/TR/scxml/#datamodel



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