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From "Rahul Akolkar (JIRA)" <>
Subject [jira] Updated: (SCXML-50) Add support for <anchor>
Date Fri, 27 Jul 2007 20:06:53 GMT


Rahul Akolkar updated SCXML-50:

        Fix Version/s: 1.0
    Affects Version/s: 0.6

You're right, neither are. As noted in the last line of Section 6.5 of the WD you mention,
"Support for the <anchor> element is optional." 

I'm tentatively setting the fix version to be v1.0 (next major release) since this is not
high on my priority list (though this is a genuine enhancement request).

Some preliminary thoughts about implementing this feature:

 * The o.a.c.s.SCInstance class will need to maintain a "snapshots" map
 * Initially, the snapshots could be stored in their entirety, but this may be resource intensive
 * It may be possible to record mere deltas when appropriate, but this will require more thought
 * Snapshots can be taken directly off of the "contexts" map (at the minimum)
 * Pieces of the datamodels should generally be Cloneable, but some thought needs to be given
about how offending bits should be treated (especially in the root context -- error?)
 * Some potential areas where spec clarifications are needed (what happens to histories etc.)

> Add support for <anchor>
> ------------------------
>                 Key: SCXML-50
>                 URL:
>             Project: Commons SCXML
>          Issue Type: Improvement
>    Affects Versions: 0.6
>            Reporter: Chris Nack
>             Fix For: 1.0
> "W3C Working Draft 21 February 2007" specifies both the <anchor> element, and the
anchor attribute for the <transition> element.  Neither appear to be supported by SCXML.

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