[jboss-user] [jBPM Development] New message: "Re: Description elements in jPDL schema"

Alejandro Guizar do-not-reply at jboss.com
Wed Feb 10 04:55:15 EST 2010

User development,

A new message was posted in the thread "Description elements in jPDL schema":


Author  : Alejandro Guizar
Profile : http://community.jboss.org/people/alex.guizar@jboss.com

> sebastian.s:
> For my part I don't agree fully. I'd like to see them parsed in (2),
> too. This could be valueable information at runtime which could be
> retrieved via the API to use it in your own application. It would also
> allow you to use short names for transititions while having long
> descriptions available in case you need them.
I believe that transition descriptions would be useful too, but the description element as it appears in the current schema does not seem to fit that purpose. The transitionType definition appears below. Annotations have been removed for brevity.
  <complexType name="transitionType">
      <element name="description" minOccurs="0" maxOccurs="unbounded" type="string" />
      <group ref="tns:eventListenerGroup" minOccurs="0" maxOccurs="unbounded" />
    <attribute name="name" type="string"/>
    <attribute name="to" type="string"/>
    <attribute name="g" type="string"/>

Note that:
* in the description element, maxOccurs is set to unbounded. The contents of which description element should be set as the transition description? The first? The concatenation of all of them? Why are multiple descriptions allowed in the first place?
* multiple event listeners may occur after the description(s). In my original comment I thought the intent was to allow each event listener to be preceded by a description, but the schema as it currently stands does not allow that.
In sum it all comes down to intent. Is the description intended to apply to the transition (in which case maxOccurs should be set to one) or to optionally precede each event listener (in which case the unbounded maxOccurs should be moved from the description and the eventListenerGroup to the sequence)?


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