[jbpm-dev] [Design of JBoss jBPM] - variable and sub-process syntax

[tom.baeyens@jboss.com]

starting on sub-process i realized that i better think out variable declarations as a whole.  i know of 4 places where we want to declare variables:

* process variables declarations
* activity variable declarations (state, task, super-state,...)
* task out variable declarations
* sub-process out variables


  <process name="...">
  |     <variable name="processVariableName" type="..." init="#{expression}">
  |       <init><string value="fixed string"/></init>
  |     <variable>
  | 
  | 
  |   <activity name="...">
  |     <variable name="activityScopedVariableName" type="..." init="#{expression}">
  |       <init><string value="fixed string"/></init>
  |     <variable>
  |     
  |     
  |   <sub-process name='...'>
  |     <in-swimlane name="superProcessSwimlaneName" sub-name="subProcessSwimlaneName" />
  |     <variable name="subProcessVariableName" init="#{expression}">
  |       <init><string value="fixed string"/></init>
  |     <variable>
  |     <out-variable name="processVariableName" init="#{expressionResolvedInSubProcessContext}">
  |     <transition>
  |       <outcome activity="subprocessactivity" />
  |       <outcome variable="subprocessvariable"><string value="..." /></outcome>
  | 
  | 
  |   <task name="...">
  |     <variable name="taskVariableName" type="..." init="#{expression}">
  |       <init><string value="fixed string"/></init>
  |     <variable>
  |     <out-variable name="processVariableName" init="#{expressionResolvedInTaskContext}">
  |     <transition name="...">
  | 

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